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An infinite long straight wire is bent i...

An infinite long straight wire is bent into a semicircle of radius `R`, as shown in the figure
. A current `I` is sent through the conductor. The magnetic field at the centre of the semicircle is :

A

infinite

B

zero

C

`(mu_0pi I)/(4 piR)`

D

`mu_0/(4 pi)I/R (pi+1)`.

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