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A current loop ABCD is held fixed on the...

A current loop ABCD is held fixed on the plane of the paper as shown in the figure. The arcs BC (radius = b) and DA radius = a) of the loop are joined by two straight wires AB and CD. A steady current I is flowing in the loop. Angle made by AB and CD at the origin O is `30^(@)`. Another straight thin wire with steady current `I_(1)` flowing out of the plane of the paper is kept at the origin.

The magnitude of the magnetic filed (B) due to loop ABCD at the origin (O) is :

A

The force on AB and DC are zero

B

The force on AD and BC are zero

C

The magnitude of the net force on the loop is given by `(mu_(0)II_(1))/(4pi) [2 (b -a) + (pi)/(3) (a +b)]`

D

The magnitude of the net force on the loop is given by `(mu_(0)II_(1))/(24ab) ( b -a)`

Text Solution

Verified by Experts

The correct Answer is:
B
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