Which is correct for phenomenon of periodic electromagnetic induc… - Vidyadip

MCQ

Which is correct for phenomenon of periodic electromagnetic induction

A
Phase difference between induced emf and induced current is $\pi $
B
Phase difference between induced emf and linked flux is zero
✓
Phase difference between induced emf and linked flux is $\pi /2$
D
Frequency of all induced parameters is double the rotational frequency of the coil

✓

Answer

Correct option: C.

Phase difference between induced emf and linked flux is $\pi /2$

c
The flux linked with the coil $\quad \phi=B \cdot A=B A \cos wt$ where $w$ is the angular speed of rotation Induced emf $E =-\frac{ d \phi}{ dt }=-( BAw )(-\sin wt )= BAw \sin wt$

$\Rightarrow E = BAw \cos \left( wt -\frac{\pi}{2}\right)$

Hence phase difference between flux linked with the coil and induced emf is $\pi / 2$

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