Physics - Magnetism Question with Solution | TestHub

Magnetic field due to$PQ$and$RS$are zero at '$O$'.

Magnetic field due to$QR$

$B_{QR}=\frac{{\mu }_0}{4\pi }\frac{10}{3\times {10}^{-2}}\frac{\pi }{4}$(outwards)

Magnetic field due to$SP$

$B_{SP}=\frac{{\mu }_0}{4\pi }\frac{10}{5\times {10}^{-2}}\frac{\pi }{4}$(inwards)

Net field$B=\frac{{\mu }_o}{4\pi }\frac{10\pi }{4\times {10}^{-2}}\left(\frac{1}{3}-\frac{1}{5}\right)$

$=1.0\times {10}^{-5}T$