A conductor having surface density σ is embedded in a dielectric medium of permittivity ε. The electric field in the medium is E. If it is known that the pressure p on the conductor surface is equal to the electric energy density in the medium, then p (in SI units) is given by:

A. $$\frac{{{\sigma ^2}}}{2}$$

B. $$\frac{\sigma }{{2\varepsilon }}$$

C. $$\frac{{{\sigma ^2}}}{{4\pi \varepsilon }}$$

D. $$\frac{{{\sigma ^2}}}{{2\varepsilon }}$$

Answer: Option D