PQ and RS are long parallel conductors s...

PQ and RS are long parallel conductors separated by certain distance. M is the midpoint between them (see the figure). The net magnetic field at M is B. Now the current 2 A is switched off. The field at M now becomes

A

B

B

2B

C

3B

D

`B//2`

Text Solution

Verified by Experts

The correct Answer is:

A

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