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6. Electromagnetic induction — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics6. Electromagnetic induction1 Mark
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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