Question

An infinite long straight wire is bent into a semicircle of radius R, as shonw in the figure. A current I is sent through the conductor. The magnetic field at the centre of the semicircle is :

• A. Infinite
• B. zero
• C. $\frac{{\mu }_0\pi I}{4\pi R}$
• D. $\frac{{\mu }_0\pi }{4\pi }\frac{I}{R}(\pi +1)$

Answer 1

The correct option is C

$\frac{{\mu }_0\pi I}{4\pi R}$

B is due to semi- circular part only.