Question

All straight wires are very long. Both $AB$ and $CD$ are arc of the same circle, both subtending right angles at the centre $O$. Then the magnetic field at $O$ is

• A. $\frac{\mu_{0} i }{4 \pi R }$
• B. $\frac{\mu_{0} i }{4 \pi R } \sqrt{2}$
• C. $\frac{\mu_{0} i }{2 \pi R }$
• D. $\frac{\mu_{0} i }{2 \pi R }(\pi+1)$

Answer 1

Answer: (C)

Correct answer is (c) $\frac{\mu_{0} i }{2 \pi R }$