Q. A physical quantity $u$ is given by the relation $u = \frac{B^{2}}{2\mu_{0}}$ here, $B =$magnetic field strength $\mu_{0} =$magnetic permeability of vacuum.

A) Energy
B) Energy density
C) Pressure
D) None of these
Explanation

Physical quantity $u = \frac{B^{2}}{2\mu_{0}}$ Unit of $u = \frac{(N/Am)^{2}}{N/A^{2}} = \frac{N^{2}A^{2}}{NA^{2}m^{2}}$ $= \frac{N}{m^{2}} = \frac{Nm}{m^{3}} = \frac{J}{m^{3}}$ $=$ energy per unit volume = energy density

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.