PQ and RS are long parallel current carrying conductors separated by a certain distance M is the midpoint between them see the

Question

PQ and RS are long parallel current carrying conductors separated by a certain distance M is the midpoint between them see the figure The net magnetic field at M is B Now the current in the wire PQ is switched off The magnitude of magnetic field at M becomes A 2B B B B C 2 D 3B 2 A P e M R S IA

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