Target Exam

CUET

Subject

Physics

Chapter

Electromagnetic Induction

Question:

When a magnet is being brought towards a coil, the emf induced in the coil does not depend on:

Options:

the number of turns in the coil

the speed of the magnet

the pole strength of the magnet

the resistance of the coil

Correct Answer:

the resistance of the coil

Explanation:

The correct answer is Option (4) → the resistance of the coil

Induced emf in a coil is given by Faraday’s law:

$E = -N \frac{d\Phi}{dt}$

where,

$N$ = number of turns, $\Phi$ = magnetic flux, and $\frac{d\Phi}{dt}$ depends on the speed of motion and pole strength of the magnet.

Therefore, the induced emf depends on:

→ Number of turns ($N$)

→ Speed of the magnet

→ Pole strength of the magnet

It does not depend on the resistance of the coil.

∴ Correct answer: Resistance of the coil