Question

Q.) Flux linked through following coils changes with respect to time then for which coil an e.m.f. is not induced
(1) Copper coils (2) Wood coil
(3) Iron coil
(4) None​

Answer 1

Answer:

none

Explanation:

induced emf does not depend on nature of coil, it means it doesn't depend on resistance.

Answer 2

The correct option is (4) "none".

Explanation:

When the flux linked through the coil changes with respect to time then it will induce an emf. It is given by :

$\epsilon=\dfrac{d(B{\cdot} A)}{dt}$

B is the magnetic field

A is the area of cross section

It is clear for the formula the induced emf is independent of the type of coil. Hence, the correct option is (4).

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Induced emf

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