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A current of 5A flows through a circular...

A current of 5A flows through a circular coil of 200 turns, each of radius 20 cm. It is placed in a uniform magnetic induction of `5xx10^(-2)" Wb/m"^(2)`, such that the plane of the coil is parallel to the field. What is the torque acting on the coil?

A

3.14 N-m

B

1.57 N-m

C

6.28 N-m

D

9.42 N-m

Text Solution

Verified by Experts

The correct Answer is:
C
In this case, `theta=90^(@)`
`:' tau n I AB sin theta=nI (pir^(2))B sin theta`
`:. tau =200xx5xx3.14 (0.2)^(2) xx5xx10^(-2) xxsin 90^(@)`
`=10^(3)xx3.14xx4xx10^(-2) xx5xx10^(-2) xx1`
`=6.28` N-m
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