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Current I is flowing in a conductor shap...

Current `I` is flowing in a conductor shaped as shown in the figure
. The radius of the curved part is `r` and the length of straight portion is very large. The value of the magnetic field at the centre 0 will be

A

`(mu_0I)/(4pir) (pi/2-1)`

B

`(mu_0I)/(4pir) (pi/2+1)`

C

`(mu_0I)/(4pir)((3pi)/2-1)`

D

`(mu_0I)/(4pir)((3pi)/2+1)`.

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