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A wire loop is rotated in magnetic field. How many times will the frequency of change in direction of induced emf per revolution be? 6 times or 2 times or 4 times.

A wire loop is rotated in magnetic field. How many times will the frequency of change in direction of induced emf per revolution be?
6 times or 2 times or 4 times.

Grade:12th pass

2 Answers

Arun
25763 Points
3 years ago
Flux of the magnetic field through the loop is= Br2 cos wtWhere = angle the normal makes with the portion of the loop induced emf.= wBr2sinwt.These is zero when wt = n i.e.,When = 0, , 2.... = 0, , 2.... etc.So, the induced emf changes direction every half rotation.Hence direction changes twice per revolution. 
Yash Chourasiya
askIITians Faculty 256 Points
one year ago
Dear Student

Flux of the magnetic field through the loop is= Br 2cos(wt)
Where = angle the normal makes with the portion of the loop
induced emf.= wBr2sin(wt).
These is zero when wt = n i.e.= 0, , 2.... etc.
So, the induced emf changes direction every half rotation.
Hence direction changes twice per revolution.

I hope this answer will help you.
Thanks & Regards
Yash Chourasiya

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