A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is: #NTA #NEET #NEETquestion #mcq #NEET2021 #Physics - Study24x7
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20 followers study24x7 01 Jan 1970 05:30 AM study24x7 study24x7

A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is:

#NTA #NEET #N...

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A

Once per revolution

B

twice per revolution

C

four times per revolution

D

six times per revolution

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  • Dev kumar
    • Consider the ring starting to rotate from its initial position where it is perpendicular to the magnetic field. Thus initially maximum flux is passing through the loop. When it rotates, the flux passing through the loop starts to decrease. When it becomes parallel to the magnetic field, the flux becomes zero and then starts to increase. Here the direction of the induced emf remains the same. Then as it rotates further, it keeps on increasing, reaches maximum. Here the direction of induced emf changes. The frequency of change of direction of the induced e.m.f. is. From the knowledge of theory, the direction of induced e.m.f. will change twice per revolution.

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