Question

Energy density (in vacuum) at a place where electric field intensity $E$ is:

• A. $\frac{1}{2}{\epsilon }_{0}E$
• B. $\frac{E^2}{2{\epsilon }_0}$
• C. $\frac{1}{2}E{\epsilon }_0^2$
• D. $\frac{1}{2}{\epsilon }_0{E}^2$

Answer 1

Answer: (D)

$\frac{1}{2}{\epsilon }_0{E}^2$

Energy density $\left(u_d\right)$

$u_d=\frac{1}{2}{\epsilon }_0{E}^2$