If the instantaneous magnetic flux and induced emf produced in a coil is `phi` and `E` respectively, then a according to Faraday's law of electromagetic induction

Options

A. E must be zero if `phi=0`
B. `E!=0 if phi=0`
C. `E!=0` but `phi` may or may not be zero
D. E=0 then `phi` must be zero

Answer

C

Explanation

For `E!=0, phi` must change
`or (dphi)/(dt)!=0`