Question

State and explain faraday's first law of electromagnetic induction

Answer 1

Faraday’s Experiment:Relationship Between Induced EMF and Flux:In the first experiment, he proved that when the strength of the magnetic field is varied then only the induced current is produced. An ammeter was connected to a loop of wire; the ammeter deflected when a magnet was moved towards the wire.In the second experiment he proved that passing a current through an iron rod would make it electromagnetic. He observed that when there a relative motion exists between themagnet and the coil, an induced electromagnetic force is created. When the magnet was rotated about its axis, no electromotive force was observed but when themagnet was rotated about its own axis then theinduced electromotive force was produced. Thus, there was no deflection in the ammeter when the magnet was held stationary.While conducting the third experiment, he recorded that galvanometer did not show any deflection and no induced current was produced in the coil when the coil was moved in a stationary magnetic field. The ammeter deflected in the opposite direction when the magnet was moved away from the loop.

Answer 2

Answer:Faraday's Law of Electromagnetic Induction :

A change in the magnetic environment of the coil or conductor will cause a voltage(emf) induce in the coil. Faraday law is the fundamental relationship which comes from the Maxwell’s equation.

◇ Faraday's First Law : A conductor is induced with an electromotive force when the surrounding magnetic field changes.

◇ Faraday's 2nd Law : The rate of change of field is directly proportional to the magnitude of the electromotive force.

◇ Faraday's 3rd Law : The sense of the induced electromotive force depends on the direction of the rate of the change of the field.

E= – ndǿ/ dt.

In this the induced emf (e) and the change in magnetic flux (d) have opposite signs.

Explanation: