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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
25750 Points
5 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
3 years 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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