Question

A uniform wire of resistance $12\Omega$ is bent in the form of a square. A cell of emf $6V$ having negligible internal resistance connected across the diagonal of the square. The magnetic induction at its centre is (in $T$)

• A. $0$
• B. ${10}^{-7}$
• C. $5\times {10}^{-7}$
• D. $\frac{{\mu }_0}{4\pi }\times 5\times {10}^{-7}$

Answer 1

The correct option is A $0$

Current flowing through two opposite is in opposite direction. Hence $B$ will cancel each other.
$\therefore B_{net}=0$