Electro Magnetic Induction And Alternating Currents Question 330

Question: The magnet is moved towards the coil with a speed v and induced emf is e. If magnet and coil recede away from one another each moving with speed v, the induced emf in the coil will be

Options:

A) e

B) 2e

C) e/2

D) 4e

Show Answer

Answer:

Correct Answer: B

Solution:

$ {{( \frac{d\varphi }{dt} )}_{\text{In first case}}}=e $

$ {{( \frac{d\varphi }{dt} )}_{\text{relative velocity}2v}}$=

$2{{( \frac{d\varphi }{dt} )}_{\text{I case}}}=2e $



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