Physics - Magnetism Question with Solution | TestHub

A current loop$\mathrm{ABCD}$is held fixed on the plane of the paper as shown in the figure. The arcs$\mathrm{BC}$(radius =$\mathrm{b}$) and$\mathrm{DA}$(radius =$\mathrm{a}$) of the loop are joined by two straight wires$\mathrm{AB}$and$\mathrm{CD}$. A steady current$\mathrm{I}$is flowing in the loop. Angle made by$\mathrm{AB}$and$\mathrm{CD}$at the origin$\mathrm{O}$is$30°$. Another straight thin wire with steady current${\mathrm{I}}_1$flowing out of the plane of the paper is kept at the origin.



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