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Two long parallel wires, separated by a distance R have equal current I flowing in each of them. The magnetic field of one exerts a force F on the other. The distance R is increased to 2R and the current in each wire is reduced from I to `I//2`. What is the force between them now?

A

4F

B

F

C

`F//4`

D

`F//8`

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The correct Answer is:
D
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