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Two long parallel conductors carry curre...

Two long parallel conductors carry currents `i` and `2I` in the same direction. The magnetic induction at a point exactly mid way between them is `B`. If the current in the first conductor is reversed in direction, the magnetic induction at the same point will be

A

B/3

B

2B

C

3B

D

B/2

Text Solution

Verified by Experts

The correct Answer is:
C
In the first case the two fields are in opposite directions and take the difference as the resultant field . In the next case , the two fields are in the same direction and add up
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