Question

explain how the movement of a magnet towards or away from a coil carrying a galvanometer produce current. write the rule to find the direction in this above coil

Answer 1

When the magnet is moved towards the coil ,there is a change in magnetic field which induces current in the coil .Same in the case when the magnet is moved away.Rule-Fleming's right hand rule..hope it helps you...

Answer 2

Answer:

i) when magnet is moved towards and away from the coil, current is induced but the velocity of the movement matters....if magnet is moved towards(or away) slowly then amount of induced current is less and vice versa and thus galvanometer moves in either cases

ii) Faraday's Law

Explanation:

ii) When a magnet is moved into a coil of wire, changing the magnetic field and magnetic flux through the coil, a voltage will be generated in the coil according to Faraday's Law. In the example shown below, when the magnet is moved into the coil the galvanometer deflects to the left in response to the increasing field.

Any change in the magnetic environment of a coil of wire will cause a voltage (emf) to be "induced" in the coil. No matter how the change is produced, the voltage will be generated. The change could be produced by changing the magnetic field strength, moving a magnet toward or away from the coil, moving the coil into or out of the magnetic field, rotating the coil relative to the magnet, etc.