Question

The Electric Field between the capacitor plates is a constant 5N/C. If the region between the plates has vacuum, what is the energy density for the capacitor?

• A. $10{\epsilon }_{0}J/m^3$
• B. $12.5{\epsilon }_{0}J/m^3$
• C. $15{\epsilon }_{0}J/m^3$
• D. $Noneofthese$

Answer 1

The correct option is B $12.5{\epsilon }_{0}J/m^3$

Direct application of formula
$ED=\frac{1}{2}{\epsilon }_0{E}^{2}ED=\frac{1}{2}{\epsilon }_0{5}^{2}ED=12.5{\epsilon }_0$