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A wire carrying current i has the config...

A wire carrying current `i` has the configuration as shown in figure. Two semi-infinite straight sections, both tangent to the same circle, are connected by a circular arc of central angle theta, along the circumference of the circle, with all sections lying in the same plane. What must be for `B` to be zero at the centre of the circle?

A

2 radian

B

4 radian

C

`pi//2`

D

`pi//4`

Text Solution

Verified by Experts

The correct Answer is:
A
`-(mul)/(2a)((theta)/(2pi))+(mu_(0)l)/(4api)=0theta=2` radian
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