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In the figure shown here, the magnetic f...

In the figure shown here, the magnetic field at O is

A

`mu_(0)I/4(1/R_(1)-1/R_(2))`

B

`mu_(0)I/4(1/R_(1)+1/R_(2))`

C

`mu_(0)I/4pi (1/R_(1)+1/R_(2))`

D

Zero

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