Q1. Write the expression for the magnetic induction at any point on the axis of a circular current – carryingcoil. Hence, Obtain an expression for the magnetic induction at the centre of the circular coil.
Answer
Ans. $1) \, B=\frac{\mu_{\circ}\,niR^{2}}{2\left(R^{2}+x^{2}\right)^{\frac{3}{2}}} $
$2) At\, the \, centre\, of \, the\,coil\,(x=0)\, B=\frac{\mu_{\circ}\,ni }{2R} $