The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?

Energy stored between the plates of capacitor is given by

now we know that

voltage across the plates of capacitor is doubled

now the energy of the capacitor will be given as

so here the energy stored between the plates of capacitor will becomes 4 times more

falling water hydro = water .. spectcular places these plants are

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it