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An infinite straight current carrying co...

An infinite straight current carrying conductor is bent into a circle as shown in the figure
. If the radius of the circle is `R`, the magnetic field at the centre of the coil is :

A

infinite

B

zero

C

`mu_0/(4 pi)(2l)/R pi`

D

`mu_0/(4 pi)(2l)/R(pi+1)`.

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