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Figure shows a square loop 10cm on each ...

Figure shows a square loop `10cm` on each side in the `x-y` plane with its centre at the origin. An infinite wire is at `z=12cm` above `y`-axis.
What is torque on loop due to magnetic force?

A

`72mNm`

B

`720mNm`

C

`72muNm`

D

`720muNm`

Text Solution

Verified by Experts

The correct Answer is:
C
`B=(mu_(0)i_(1))/(2pir)`
`F=Bi_(2)((10)/(100))=r=(Fcostheta)xx(10)/(100)`
`Bi_(2)(10)/(100)costhetaxx(10)/(100)=(mu_(0)i_(1)i_(2))/(2pir)xx(10)/(100)xx(12)/(13)xx(10)/(100)`
`(2xx10^(-7)xx65xx78)/((13//100))xx((10)/(100))^(2)xx(12)/(13)`
`72xx10^(-6)Nm`
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