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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

Zero

B

`(mu_(0)I(b-a))/(24ab)`

C

`(mu_(0)l)/(4pi)[(b-a)/(ab)]`

D

`(mu_(0)l)/(4pi)[2(b-a)+(pi)/(3)(a+b)]`

Text Solution

Verified by Experts

The correct Answer is:
B
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