- The arc's \( B C \) (radius \( =b \) ) and \( A D \) (radius \( =a \) ) of loop
- are joined by the straight wires \( A B \) and \( C D \). A steady current \( I \) is flowing in the loop. Angle made by \( A B \) and \( C D \) at the origin is \( 30^{\circ} \). Another straight thin wire with
- steady current \( I \), flowing out of plane of the paper is
- kept at the origin.
- The magnitude of the magnetic field \( B \) due to loop \( A B C D \) at the origin \( O \) is
(a) zero
(b) \( \frac{\mu_{0} I(b-a)}{24 a b} \)
(c) \( \frac{\mu_{0} I}{4 \pi}\left(\frac{b-a}{a b}\right) \)
(d) \( \frac{\mu_{0} I}{4 \pi}\left[2(b-a)+\frac{\pi}{3}(a+b)\right] \)
\( \mathrm{P} \)
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