Question

Whenever a magnet is moved either towards or away from a conducting coil. An emf is induced the magnitude of which is independent of

Answer 1

Given info : A magnet is moved either towards or away from a conducting coil.

To find : An emf is induced the magnitude of which is independent of ....

Solution : induced emf is the negative of rate of change in magnetic flux.

i.e., ε = - dΦ/dt

We know, magnetic flux, Φ = NBA

so, ε = - d(NBA)/dt

Therefore it is clear that, induced magnetic field depends on,

1. number of turns
2. magnetic field
3. cross sectional area
4. time

But it is independent of resistance of coil.

Therefore magnitude of induced emf is independent of resistance of coil.