Question

If a magnet is plugged into a coil, then the magnitude of induced emf does not depend upon

• A. The number of turns in the coil
• B. The medium of the core of the coil
• C. The strength of the magnet
• D. The resistance of the coil

Answer 1

Answer: (D)

The magnitude of induced emf is given by, $e=\frac{Nd\varphi }{dt}=NB\frac{ds}{dt}$
Which depends upon the number of turns (N), magnetic field intensity (B) which depends upon the medium, rate of change of area $\left(\frac{ds}{dt}\right)$ which depends upon insertion speed of magnet. It is independent of resistance of the coil.