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A wire in the form of a circular loop of...

A wire in the form of a circular loop of radius `10 cm` lies in a plane normal to a magnetic field of `100 T`. If this wire is pulled to take a square shape in the same plane in `0.1 s`, find the average induced emf in the loop.

A

6.70 volt

B

5.80 volt

C

6.75 volt

D

5.75 volt

Text Solution

Verified by Experts

The correct Answer is:
3
According to Faraday.s law of electromagneticinduction
`E_(innuced)=(-trianglephi)/(trianglet)=B((A_(f-A_(i))))/(trianglet)`Letr be the radius of circle, then side of square formed =`(2pir)/(4)=(pi)//(2)`Change is area of loop =`A_(i)-A_(f)=pir^(2)((pir)/(2))^(2)=)pi(4-pi)r^(2))/(4)`
Hence averag
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