Question

A circular loop of radius R carrying I lies in x-y plane. The centre of the loop coincides with the origin, then magnitude flux passing through x-y plane is

• A. $\varphi \propto R^2$
• B. $\varphi \propto R$
• C. $\varphi \propto i$
• D. Zero

Answer 1

The correct option is A $\varphi \propto R^2$

$\begin{array}{c}\varphi =BA\cos \theta \\ \varphi =B\times \pi R^2\cos \theta \\ \varphi =\pi B{R}^2\\ \varphi \propto R^2\end{array}$