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A conducting circular loop of radius r c...

A conducting circular loop of radius r carries a constant current i. It is placed in a uniform magnetic field B such that B is perpendicular to the plane of the loop. The magnetic force acting on the loop is

A

zero

B

ir B

C

`2pi` ir B

D

`pi irB`

Text Solution

Verified by Experts

The correct Answer is:
A
In this case, current / for the upper half of the loop is.just opposite to that of lower loop.
Force `=l(lxxB)=i(lxxB)`. Due to opposite directions of currents he two fields cancel each other.
`:.` Magnetic force on loop = zero
`:.` Magnitude of force Bil - Bil = zero
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