Question

A magnet is moved towards a coil (i) quickly (ii) slowly, then the induced e.m.f. is

• A. larger in case (i)
• B. smaller in case (ii)
• C. equal to both the cases
• D. larger or smaller depending upon the radius of the coil

Answer 1

Answer: (A), (B)

The correct options are
A smaller in case (ii)
B larger in case (i)

According to Faraday's Law: $E=\frac{d\varphi }{dt}$
If the magnet moves quickly, the rate of change of flux is also higher, hence the EMF induced is larger in case (i).