Question

An induced emf is produced when a magnet is plunged into a coil. The strength of the induced emf is independent of :

• A. the strength of the magnet
• B. number of turns of coil
• C. the resistivity of the wire of the coil
• D. speed with which the magnet is moved

Answer 1

Answer: (C)

the resistivity of the wire of the coil

$EMF=-\frac{nd\varphi }{dt}=\frac{-d\left(nBA\right)}{dt}$
Where $n$ is number of turns in coil
So, emf is dependent on number of turns of coil, strength of magnet and speed with which magnet is moved. emf is independent of resistivity of wire of the coil.