A wire carrying current `i` has the configuration as shown in figure. Two semi-infinite
Channel: Doubtnut
Date: 2020-07-12

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?