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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

irB

C

`2pi` ir B

D

`pi rB`

Text Solution

Verified by Experts

The correct Answer is:
A
In this case, current l for the upper half of the loop is just opposite to that of lower loop.
Force ` = l( I xx B) = I (l xx B)` . Due to opposite direction of current he two fields cancel each other .
`therefore` Magnetic froce on loop = zero
`therefore ` Magnitude of force = Bil - Bil = zero
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