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PQ and RS are long parallel conductors s...

PQ and RS are long parallel conductors separated by certain distance. M is the mid-point 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

2B

B

`B`

C

`B/2`

D

`3B`

Text Solution

Verified by Experts

The correct Answer is:
B
`B=(mu_(0)(2))/(2piR)-(mu_(0)(1))/(2piR),B'(mu_(0)(1))/(2piR)=B`
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