A parallel plate capacitor having a plate separation of 2 mm is charged by connecting it to a 300 V supply. The energy density is :

• A

  $0.01 \mathrm{J}/{\mathrm{m}}^3$

• B

  $0.1 \mathrm{J}/{\mathrm{m}}^3$

• C

  $1.0 \mathrm{J}/{\mathrm{m}}^3$

• D

  $10 \mathrm{J}/{\mathrm{m}}^3$