Q. A current of $1\ ampere$ is passed through a straight wire of length $2.0\ metres$. The magnetic field at a point in air at a distance of $3\ metres$ from either end of wire and lying on the axis of wire will be
A) $\frac{\mu_{0}}{2\pi}$
B) $\frac{\mu_{0}}{4\pi}$
C) $\frac{\mu_{0}}{8\pi}$
D) Zero
Explanation
(d) The magnetic field at any point on the axis of wire be zero
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.