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Magnetic Effects of Current and Magnetism Part 1

Section: Physics

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Question : 77

Total: 100

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 steady current I1 flowing out of the plane of the paper is kept at the origin.

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

‌
µ0I(b−a)
24ab
‌
µ0I
4π
[‌
b−a
ab
]
‌
µ0I
4π
[2(b−a)+π∕3(a+b)]
zero

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