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Wires 1 and 2 carrying currents $i_1$ and $i_2$ respectively are inclined at an angle $\theta$ to each other. What is the force on a small element $dl$ of wire 2 at a distance $r$ from wire 1 (as shown in figure) due to the magnetic field of wire 1 ?<br>



( A ) $\frac{\mu_0}{2 \pi r}\; i_1 i_2\; dl\; \tan \theta$
( B ) $\frac{\mu_0}{4 \pi r}\; i_1 i_2\; dl\; \sin \theta$
( C ) $\frac{\mu_0}{2 \pi r}\; i_1 i_2\; dl\; \sin \theta$
( D ) $\frac{\mu_0}{2 \pi r}\; i_1 i_2\; dl\; \cos \theta$

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