$PQRS$ is a square loop made of uniform conducting wire the current enters the loop at $P$ and leaves at $S$. Then the magnetic field will be
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(b) $B$ at centre due to a straight conductor $=\frac{\mu_{0}}{4 \pi} 1(\sin \alpha+\sin \beta)$
Net $\mathrm{B}$ at centre comes out to be zero
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