The direction of the induced magnetic field is sometimes remembered by Maxwell's corkscrew rule. The electric motor is then constructed so that the expulsion of the conductor out of the magnetic field causes it be placed inside the next magnetic field, and for this switching to be continued indefinitely. Dynamos - use magnets, a coil and movement to produce electricity in exactly the opposite way to the motor. The rule for generators can be recalled by remembering that either the letters "g" and "r" is common to both "right" and "generator", or the phrase "Jenny is always right" "Genny" being a common shortened version of Generator. In late 19 th century, John Ambrose Fleming introduced both these rules and as per his name, the rules are well known as Fleming's left and right hand rule. The magnetic field can be imagined by considering numbers of closed magnetic lines of force around the conductor.
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Fleming's left-hand rule for motors
Directionally means these rules do not show the magnitude but show the direction of any of the three parameters magnetic field, current, force if the direction of other two are known. The electric motor is then constructed so that the expulsion of the conductor out of the magnetic field causes it be placed inside the next magnetic field, and for this switching to be continued indefinitely. The direction of the induced magnetic field is sometimes remembered by Maxwell's corkscrew rule. The magnet field of the coil pushes away from the magnetic field in the surrounding magnet, so turning the coil and the motor spindle. First of all you need to point your fingers like a pretend gun, with the index finger acting as the barrel of the gun and the thumb acting as the hammer. Consequently, there will be a large number of magnetic field lines in a small space on that side of the conductor, and a dearth of them on the original side of the conductor.
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Fleming's left hand rule and right hand rule
In the figure it is shown that a portion of a conductor of length L placed vertically in a uniform horizontal magnetic field strength H, produced by two magnetic poles N and S. If the motor is then disconnected from the fully charged battery, and connected instead to a completely flat battery, the vehicle will decelerate. This uses the conventional symbolic parameters of F for Lorentz force , B for magnetic flux density and I for electric current , and attributing them in that order FBI respectively to the thumb, first finger and second finger. Views Read Edit View history. Newer Post Older Post Home. A left hand can be held, as shown in the illustration, so as to represent three mutually orthogonal axes on the thumb, fore finger and middle finger.
Description: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. If i is the current flowing through this conductor, the magnitude of the force acts on the conductor is, Hold out your left hand with the forefinger, second finger and thumb at the right angle to one another. You need to contort your hand in an unnatural position for this rule, illustrated below. In other projects Wikimedia Commons. The content on this website is copyrighted and may not be reproduced. Recieve free updates Via Email!