(i) what happens to the magnitude of the charge on each plate of a capacitor if the potential difference between the conductors is doubled? it becomes four times larger. it becomes two times larger. it is unchanged. it becomes one-half as large. it becomes one-fourth as large. (ii) if the potential difference across a capacitor is doubled, what happens to the energy stored? it becomes four times larger. it becomes two times larger. it is unchanged. it becomes one-half as large. it becomes one-fourth as large.