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A wire carrying current I and other carr...

A wire carrying current `I` and other carrying `2I` in the sam direction produce a magnetic field `B` at the midpoint. What will be the field when `2I` wire is swiched off?

A

B/2

B

2B

C

B

D

4B

Text Solution

Verified by Experts

The correct Answer is:
C
`B = (mu_(0) 2I)/(2pi r) - (mu_(0) I)/(2pi r ) = (mu_(0) I)/(2pi r)`
When 2I switch off
`B. = (mu_(0)I)/(2pi r) = B`
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