A wire carrying current has the configuration shown in figure. Two semi-infinite straight sections, each tangent to the same circle, are connected by a circular arc, of angle , along the circumference of the circle, with all sections lying in the same plane. What must (in rad) be in order for to be zero at the centre of circle?

A wire carrying current has the configuration shown in figure. Two semi-infinite straight sections, each tangent to the same circle, are connected by a circular arc, of angle , along the circumference of the circle, with all sections lying in the same plane. What must (in rad) be in order for to be zero at the centre of circle?

1 Answer - 5876 Votes

3537

**(2)**

Magnetic field at due to wire 1 is,

and that due to wire 2 is

Magnetic field at the centre due to circular arc subtending angle at the centre is given by

If