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The wire loop formed by joining two semi...

The wire loop formed by joining two semicircular sections of radii `R_1` and `R_2` and centre C, carries a current `I` as shown
. The magnetic field at C has a magnitude

A

`(mu_0I)/4(1/R_1-1/R_2)`

B

`(mu_0I)/2(1/R_1-1/R_2)`

C

`(mu_0I)/4(1/R_1+1/R_2)`

D

`(mu_0I)/2(1/R_1+1/R_2)`.

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