Equal but opposite charges Q are placed on the square plates of an airfilled parallel-plate capacitor. The plates are then pulled apart to twice their original separation, which is small compared to the dimensions of the plates.

Which of the following statements about this capacitor are true? (There may be more than one correct choice)

A) The energy stored in the capacitor has doubled.
B) The energy density in the capacitor has increased.
C) The electric field between the plates has increased.
D) The potential difference across the plates has doubled.
E) The capactiance has doubled.

Please explain why you chose that answer.

A) The energy stored in the capacitor has doubled.

D) The potential difference across the plates has doubled.

E) The capacitance has doubled.

Explanation:

According to the formulas, E = QV^2 and Capacitance = (epsilon) A/d

The potential difference between the plated has been doubled as the separations have been increased by two times. As the potential difference has been doubled, the energy stored in the capacitor has also been doubled. The overall capacitance will be increased by two times as the separation increases.

do you have a formula possibly

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.