The figure shows a conducting loop \( A B C D A \) placed in a uniform magnetic field perpendicu...

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The figure shows a conducting loop \( A B C D A \) placed in a uniform magnetic field perpendicular to its plane. The part \( A B C \) is the \( (3 / 4)^{\text {th }} \) portion of the square of side length \( l \). The part \( A D C \) is a circular arc of radius \( R \). The points \( A \) and \( C \) are connected to a battery which supply a current \( I \) to the circuit. The magnetic force on the loop due to the field \( B \) is
(a) Zero
(b) \( B I l \)
(c) \( 2 B I R \)
(d) \( \frac{B I l R}{l+R} \)
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