Q.
Magnetic field induction at the centre $O$ of a square loop of side ‘$a$’ carrying current $I$ as shown in figure is
A) $\frac{\mu_{0}I}{\sqrt{2}\pi a}$
B) $2\sqrt{2}\frac{\mu_{0}I}{\pi a}$
C) $\frac{2\mu_{0}I}{\pi a}$
D)
Explanation
(d) $AB$ and $DC,\ AD$ and $BC$ are in the opposite direction pairs. They are so situated that currents of each pair produce equal and opposite magnetic fields at the centre $O$ of the loop. Hence, the resultant magnetic field induction at the centre $O$ of the loop is zero
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.