Question

A single turn circular coil is connected to a cell as shown. Magnetic field at the centre $O$ of the coil is

• A. $\frac{2 \pi I}{r}$
• B. $2 \pi I r$
• C. zero
• D. $\frac{I}{2 \pi r}$
• E. $\frac{I}{\pi r}$

Answer 1

Answer: (C)

The magnetic fields produced at $O$ by both the semicircles are equal and opposite. So, the net magnetic field at the centre $O$ of the coil is zero.