Two parallel wires carrying current I an...

Two parallel wires carrying current I and 2I in same direction have magnetic field B at the midpoint between them. If the current 2I is switched off, the magnetic field at that point will be

B/2

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The correct Answer is:

`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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