Physics - Magnetism Question with Solution | TestHub

Force on$SR$and$PQ$are equal but opposite so their net will be zero.

Force between two parallel conductors carrying currents$I_1 \mathrm{a}\mathrm{n}\mathrm{d} I_2$

$F=\frac{{\mathrm{\mu }}_0}{2\mathrm{\pi }}\frac{I_1{I}_{2}l}{r}$

Where$r=$distance between two parallel conductors

$F_{PS}=\frac{2\times {10}^{-7}\times 30\times 20\times 10\times {10}^{-2}}{{10}^{-2}}$

$=6\times {10}^{-4}$

$F_{QR}=\frac{2\times {10}^{-7}\times 30\times 20\times 10\times {10}^{-2}}{12\times {10}^{-2}}$

$={10}^{-4 }$N
$F_{\mathrm{n}\mathrm{e}\mathrm{t}}=F_{PS}-F_{QR}$

$=6\times {10}^{-4}$

$=5\times {10}^{-4}N$