Question

The magnetic field at centre $P$ is

• A. $\frac{{\mu }_{0}I}{4r}$
• B. $\frac{{\mu }_{0}I}{2r}$
• C. $\frac{{\mu }_{0}I}{8r}$
• D. zero

Answer 1

Answer: (A)

The magnetic field at centre of half circular coil $B=\frac{{\mu }_{0}I}{4r}$