A capacitor consists of a set of two parallel plates of area A separated by a distance d. This capacitor is connected to a battery and charged until its plates carry charges If the separation between the plates is doubled, the electrical energy stored in the capacitor will

The electrical energy stored in the capacitor will be cut in half.

Explanation:

The energy in a capacitator is given by E=C/2 and the formula for the Capacitance in a capacitator is C= = ε .

So if we replace C = ε  in the first equation we have:

E = ε

the correct choice is a .

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b. a lightning bug, plug of grass, and a worm