Faraday's Laws of Electromagnetic Induction

 WORK EDUCATION

Faraday's Laws of Electromagnetic Induction :

First Law. Whenever any conductor is made to rotate in a magnetic field, and hence cuts the magnetic lines of force or the flux, e.m.f. will be induced in that conductor.

Second Law. The second law states that the magnitude of the induced e.m.f. is directly proportional to the rate of change of flux linked with the conductor.

Assuming that the coil has N number of turns and the flux linked with the coil changes from the initial value o/wb(weber) to the final valueo/ wb in time t second, then the flux linked is the product of the number of turns and the flux linked with the coil. There have,

Initial flux linked=No/1

Final flux linkage-No/2

Induced e.m.f.= e= N(o/1-o2)/t

Fleming's Right Hand Rule. This rule is applied for generators to find out the direction of the induced current. In this case, the direction of the induced emf in a conductor depends upon the direction of motion conductor and also upon the direction of magnetic lines of force which can be expressed by Fleming's right hand rule Stretch out the fore finger, the middle finger and the thumb of right hand mutually perpendicular to each other. If the fore finger denotes the direction of magnetic lines of force and the thumb, the direction of motion of the conductor, then the middle finger indicates the direction

of induced current

Fleming's Left Hand Rule. This rule is applied for motors to find out the motion of a conductor carrying current when placed in a magnetic field. In this case there is a definite relation between the magnetic lines of force, direction of the current and direction of the motion of the conductor which can be expressed by Fleming's left hand rule. Stretch out the thumb, the fore-finger and the middle finger of the left hand perpendicular to each other. If the fore-finger points in the direction of the lines of magnetic field and the middle finger indicates the direction of the current, then the thumb indicates the direction of the motion of the conductor.