Different hands need to be used for motors and generators because of the differences between cause and effect. Flemings right hand rule use the thumb, central and first finger for direction identification. Using the right hand, the thumb is in the direction of the motion, the first finger points in the. May 25, 2015 but these rules known as flemings left hand rule for motor and flemings right hand rule for generator. Flemings right hand rule is used to find the direction of current in the conductor of a generator. Aug, 2009 1 fleming s left hand rule is used to find the direction of magnetic force acting on a charged particle moving in a magnetic field, or a current carrying conductor kept in a magnetic field. Flemings left and right hand thumb rules explained electrical4u. Fleming s right hand rule for generators shows the direction of induced current when a conductor attached to a circuit moves in a magnetic field. Flemings left hand rule mini physics learn physics.
Jul 19, 2005 i am quite confused about the motor rule. It is very difficult to bend my fingers for solving the. Using the right hand, the thumb is in the direction of. The rules are called as fleming s left hand rule for motors and fleming s right hand rule for generators. This relation is directionally determined by flemings left hand rule and flemings right hand rule respectively. It is also used to convert the notations for vectors. Fleming s rules are a pair of visual mnemonics for determining the relative directions of magnetic field, electric current, and velocity of a conductor there are two rules, one is fleming s left hand rule for motors which applies to situations where an electric current induces motion in the conductor in the presence of magnetic fields lorentz force. Adjust your hand in such a way that the forefinger points in the direction of magnetic field and the centre finger points in the direction of current in the conductor, then the direction in which the thumb points gives the direction of motion of the conductor. Fleming s left hand rule is used to find the direction of magnetic force acting in an electric motors while fleming s right hand rule is used to find the direction of induced current in an electric generators. Solved numerical our mission is to provide a free, worldclass education to anyone, anywhere.
We have a brilliant team of more than 60 support team members looking after discussions on the student room, helping to make it a fun, safe and useful place to hang out. Flemings lefthand rule gives the direction of magnetic force acting on a conductor whereas flemings righthand rule is used to find the. It then deflected towards north by the magnetic force. Suppose that the current is in the north direction, and. Flemings left hand rule and right hand rule march 23, 2018 november 22, 2017 by electricalvoice when a current carrying conductor is placed in the magnetic field, conductor experiences a force due to the magnetic field. Questions about flemings left hand rule physics forums. Physics difference between fleming s right and left hand rule duration. I am finding it difficult because the magnetic field and movement are parallel instead of at right angles. What is the difference between flemings right hand rule. Difference between flemings lefthand and righthand rule. The left hand rule requires you to hold out your left hand with the forefinger, second finger and thumb perpendicular to each other.
Fleming left hand rule and fleming right hand rulewhenever a current carrying conductor comes under a magnetic field, there will be force acting on the conductor and on the other hand, if a conductor is forcefully brought under a magnetic field, there will be an induced current in that conductor. It can be used to determine the direction of current in a generators windings. Explain flemings right hand rule and flemings left hand. Sep 06, 2006 when the fore finger,thumb,mid finger of the left hand are held in right angles to each other,the fore finger shows the direction of the magnetic field,mid finger shows the direction of the current and the thumb is held in the direction of the motion of the conducter. This video teaches you how to properly use them when solving. Here we take current direction from positive side to negative side. Difference between flemings left and right hand rules. What do you remember about fleming s left hand rule and the motor effect. Fleming s left hand rule for motors is a visual depiction used to determine direction of rotation in a motor. What is the difference between flemings righthand rule. State the difference between flemings lefthand rule and.
According to this rule if the index finger is pointed in the direction of a magnetic field, and middle finger, is at a 90 degree angle to your index and points in the direction of the current, then your extended. In the late 19th century, john ambrose fleming introduced both these rules and as per his name, the rules are well known as flemings left and right hand rule. Flemings left hand rule is used to determine the direction of movement in the motor action between a magnetic field and a current flowing through a conductor. Aug 11, 2011 suppose a positively charged particle is projected towards the west direction.
These rules are called as flemings lefthand rule used for motors and flemings righthand rule used for generators respectively. Electromagnetic induction too flemings right hand rule. This rule provides a simple and quick way of finding directional relationships between variables of faraday s law without using lenz s rule. Then, if the forefinger points in the direction of the field and the second finger in the direction of the current, the thumb will point in the direction of the motion fig.
When a conductor such as a wire attached to a circuit moves through a magnetic field, an electric current is induced in the wire due to faradays law of induction. Flemings left hand rule gives the direction of magnetic force acting on a conductor whereas flemings right hand rule is used to find the direction of induced current. Fleming s left hand rule is used for electric motors, while fleming s right hand rule is used for electric generators. If you point your thumb in the direction of the current, as shown, and. What the difference between fleming left hand rule and right hand rule get the answers you need, now.
Flemings left hand rule can be applied to find the direction of the thrust on a conductor carrying a current in a magnetic field. What is the difference between the two and why cant we use just one rule. These convenient appendages help us understand the interaction between electricity and magnetism via the right hand rule and the left hand rule. Current is moving into the monitorcross applying the left hand rule,wire will move up. Flemings left hand rule and flemings right hand rule. Flemings righthand rule for electric motors is one of a pair of visual mnemonics, the other being flemings lefthand rule for generators. State the difference between flemings left hand rule and flemings right hand rule. Fleming s right hand rule for generators tells us that if we take our right hand and extend the thumb, and also the index and the middle finger such that they are all at right angles to each. How to use the right hand rule to find the direction of. Here, the index finger indicates the direction of magnetic field, and thumb indicates the motion of conductor, then the middle finger will indicate the direction of the induced e. What is the difference between flemings left hand rule and flemings right hand rule. Ask your doubt of flemings left hand rule and get answer from subject experts and students on topperlearning. A british electrical engineer sir john ambrose fleming invented and published a rule called flemings right hand rule. Flemings right and left hand rule are both used in different situations.
Now applying flemings right hand rule we get the current to be flowing and passing through cd and then ab. Magnetism and electromagnetism three and four mark. This relation is directionally determined by flemings left hand rule and flemings right hand rule respectively these rules do not determine the magnitude but instead show the direction of any of the three parameters magnetic field, current, force when the direction of. How is the flemings left hand rule used in determining the. They were originated by john ambrose fleming, in the late 19th century, as a simple way of working out the direction of motion in an electric motor, or the direction of electric current in an electric generator. Moving charged particles in magnetic field flemings left. Flemings left hand rule and right hand rule electricalvoice. The fore finger points from north to south, the middle finger point. The right hand rule, illustrated at left, simply shows how a currentcarrying wire generates a magnetic field.
This video teaches you how to properly use them when solving questions. Laws of physics in motor flemings left and right hand rules are triggered. How to apply flemings left and right hand rules to the. Difference between flemings left hand rule and right hand. Electric generator lenzs law part 1 left or right hand rule physics. The same change in the direction takes place in case of electric motor. Difference between fleming s right and left hand rule. Fleming s right hand rule for generators shows the direction of induced current when a conductor moves in a magnetic field. Earths magnetic field acting on an aeroplane q help with two magnetic induction concepts physics direction of current magnetic fields. Fleming introduced two important rules to determine the direction of motion or force in case of motor and the direction of induced current in case of a generator. What is the difference between left hand rule and right.
Name the electrical devices where these rules find an important application. A mnemonic that uses the right hand to show the direction of induced current when a conductor moves in a magnetic field. Mar 08, 2016 whenever, a current carrying conductor comes under a magnetic field, there will be force acting on the conductor and on the other hand, if a conductor is forcefully brought under a magnetic field, there will be an induced current in that conductor. Flemings left hand rule and right hand rule by kiran daware electrical laws if a current carrying conductor placed in a magnetic field, it experiences a force due to the magnetic field. Hold the forefinger, the centre finger and the thumb of your left hand at right angles to one another. The electromagnetism is most widely used technique and predict the current induction direction. Also please tell me how to use this rule in solving such type of questions. These rules only show the direction and do not determine the magnitude of magnetic field, current and force. Whenever, a current carrying conductor comes under a magnetic field, there will be force acting on the conductor and on the other hand, if a conductor is forcefully brought under a magnetic field, there will be an induced current in that conductor. Jan 01, 2008 well the left hand rule is when you make the thumbs up sign. Named after british engineer john ambrose fleming, who invented it. These rules try to explain the relationship between magnetic field, the current and force. Physics difference between flemings right and left hand. But these rules known as flemings left hand rule for motor and flemings right hand rule for generator.
Describe how flemings left hand rule can be used to determine the direction in which the rod will move when the switch is closed, and state the direction. Flemings lefthand rule motor rule physics homework help. The flemings right hand rule is common rule and used in magnetic field in conductor. The flemings left hand rule shows what happens when. Flemings left and right hand rules were first discovered and described by john ambrose fleming in 19th century. Thumb is direction of current and the fingers show the magetic field around the wire. Jun 07, 2014 can i use fleming s right hand rule to determine the direction of current when a magnet is moved into a coil s of wire. Fleming s left hand rule for electric motors is one of a pair of visual mnemonics, the other being fleming s right hand rule for generators.
These rules are called as flemings lefthand rule used for motors and flemings right hand rule used for generators respectively. For a currentcarrying wire, the rule that if the fingers of the left hand are placed around the wire so that the thumb points in the direction of electron. In this physics video lecture in hindi for class 12 we explained the difference between fleming s left hand rule and fleming s right hand rule. A generator is where movement causes a current, and a motor is where a. Interpreting fleming s righthand rule the thumb indicates the direction of the motion, the fore finger indicates the direction of the magnetic field and the middle finger represents the direction of the induced current.
The right hand rule is for a generator, and the left hand rule is for a motor. Suppose the magnetic field is from right to left and the motion of the wire is downwards then according to the right hand rule the induced current will be in the straight direction. Is flemings left hand rule applicable to both positive. Flemings lefthand rule motor rule place the forefinger, second finger, and thumb of the left hand mutually at right angles. A left hand rule for faraday s law is presented here. Whenever a current carrying conductor is placed in a magnetic field, the conductor experiences a force. Pdf laws of physics in motor flemings left and right hand. How can i determine the direction of magnetic field acting on a currentcarrying conductor. Thus, a potential difference v is created between the ends of the conductor. Fleming s lefthand rule for electric motors is one of a pair of visual mnemonics, the other being fleming s right hand rule for generators. Flemings left hand rule and flemings right hand rule physics. Fleming s righthand rule for generators shows the direction of induced current when a conductor attached to a circuit moves in a magnetic field.
Find out information about fleming s left hand rule. How to use the right hand rule to find the direction of magnetic force this right hand rule relates magnetic force f b, magnetic. Flemings left hand rule vs right hand rule in hindi. Confused about flemings lefthand and righthand rules. The left hand is held such that the thumb, index finger and middle finger are mutually at right angles to each other. Get an answer for how is the fleming s left hand rule used in determining the movement of wire when the current is switched on in a magnetic field. That lets you figure out the emf induced in a wire moving through a bfield as well as the force on a currentcarrying wire in a bfield. Fleming s right and left hand rule are both used in different situations.
Comparison of fleming left hand rule and fleming right. Confused about flemings lefthand and righthand rules the. Fleming s left hand rule whenever a current carrying conductor is placed in a magnetic field, the conductor experiences a force which is perpendicular to both the magnetic field and the direction of current. Flemings right hand rule states that the direction of induced current indicated by middle finger is perpendicular to both the direction of magnetic field from north pole to south pole indicated by index finger and the direction of movement or motion indicated by thumb. Extend your thumb, index finger and middle finger of your left hand at right angles to. Choosing between then or than can be difficult since they are only a single letter apart and they sound pretty close to each other, but if youre not sure which word to use and when, dont worry. Does flemings right hand rule give the same effect as. There are at least three ways to apply the right hand rule. Fleming s left hand rule and fleming s right hand rule.
Jun 02, 2019 in both flemings left and right hand rules, there is a relation between the magnetic field, the current and force. According to flemings left hand rule if the thumb, forefinger and middle finger of left hand are. The best answer is that if you cant reverse the thing that is made, you have to use made from, but if you can reverse it, its better to use made of for example, the table is made of wood as the wood is still seen at its nature, but the cheese is made from milk because cheese. But if we use the left hand rule in this same situation to find the direction of motion of. In 1885 john ambrose fleming was appointed head of electrical technology at university college london, where he devised his right hand and left hand rule for the relationship of motion of a wire in an electrical field. Mar 10, 2017 our smart downloadable video courses are live at our youtube channel helps engineering students and faculty of all levels in building conceptual knowledge through best. Fleming s lefthand rule is mainly applicable to electric motors and fleming s righthand rule is mainly applicable to electric generators. Fleming right hand rule easy remembering tips electrical4u. Jul 08, 2016 fleming s left hand rule force on a current carrying wire placed in a magnetic field. How to know when to use flemings right hand rule and when to use. It is unfortunate that the physics of magnetism got saddled with several different hand rules, and that they use different hands. Physics difference between flemings right and left hand rule. Dec 26, 2015 the direction of this force is always right angles to the plane containing both the conductor and the magnetic field, and is predicted by flemings lefthand rule. Basically, flemings left hand rule is used to find the direction of force on the conductor.
If the forefinger represents the direction of the field and the second finger represents that of the current, then thumb gives the direction of the force. Is there any alternative to flemings left right hand rule. Fleming s left hand rule it is found that whenever a current carrying conductor is placed inside a magnetic field, a force acts on the conductor, in a direction perpendicular to both the directions of the current and the magnetic field. How to remember flemings left and right hand rule pisquare. It can be used to determine the direction of current in a generator s windings. Thumb is voltage, index is current and middle is direction of motion. Flemings right hand and left hand rule physics stack exchange. If not, does this mean i am only allowed to use it when a wire. Please tell me in detail how to do this by using the fleming s left hand rule. The direction of this force can be found using flemings left hand rule also known as flemings lefthand rule for motors. Flemings right hand rule and left hand rule does the 2017 bmat syllabus include flemings right hand rule.
Flemings right hand rule is mainly applicable for the electric generator and fleming left hand rule is applicable for an electrical motor. Hence there is difference in some aspect of divine mechanics \of. Use this interactive online quiz and printable worksheet to make sure you. Pdf it is believed that north and south magnetic fields or forces which are mediated by. Flemings left hand rule article about flemings left hand. Fleming s left hand rule shows the direction of the thrust on a conductor carrying a current in a magnetic field. What rule is used to determine the direction of the magnetic force or thrust on a wire carrying current in a magnetic field. Fleming s left and right hand rule why do we use two hands for the same thing. It is a direct consequence that comes from both flemings right and left hand rules not the grip one although it may seem to say the same. The right hand rule is used for generators and current generated by a motion.
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