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Two infinite long wire A and B are separ...

Two infinite long wire A and B are separated at a and current are `I_1` and `I_2` respectively. The distance from wire B where net magnetic field zero is

A

`aI_1/(I_1 - I_2)`

B

`aI_2/(I_1 + I_2)`

C

`aI_1/(I_1 + I_2)`

D

`(3aI_1)/(I_1 - I_2)`

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