Question

A pair of closely spaced square conducting plates measure 13 cm on a side. The electric-field energy density between the plates is 4.5 kJ/m². What is the charge on the plates?
A) -8.68 × 10⁻⁹ C
B) -1.64 × 10⁻⁸ C
C) -3.15 × 10⁻⁸ C
D) -5.98 × 10⁻⁸ C