Question

The magnetic field at centre, $P$ will be

• A. $\frac{\mu_{0}}{4 \pi}$
• B. $\frac{\mu_{ 0 }}{\pi}$
• C. $\frac{\mu_{ 0 }}{2 \pi}$
• D. $4 \mu_{0} \pi$

Answer 1

Answer: (C)

The correct option is $C \frac{\mu_{0}}{2 \pi}$
$B =\frac{\mu_{0} 2 i_{1}}{4 \pi r_{r}}-\frac{\mu_{0} 2 i_{2}}{4 \pi r_{r}} $
$=\frac{\mu_{0} 4}{4 \pi r}\left(i_{1}-i_{2}\right)$
$=\frac{\mu_{0} 4}{4 \pi 5}(5-2.5)$
$=\frac{\mu_{0}}{2 \pi}$