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A current carrying conductor is bent int...

A current carrying conductor is bent into a quarter of a cirle of radius R as shown
. The magnetic field at the center O is

A

`(mu_0J)/(8R)`inwards

B

`mu_0I`outwards

C

`(mu_0I)/(4R)`inwards

D

`(mu_0I)/(4R)`outwards.

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