A series combination of n1 capacitors each of value [C_1] is charged by a source of potential difference 4V. When another parallel combination of [n_2] capacitors each of value [C_2] is charged by a source of potential difference V it has the same (total) energy stored in it as the first combination has. The value of [C_2] in terms of [C_1] is then [AIPMT (S) 2010]

\[\frac{16{{C}_{1}}}{{{n}_{1}}\,{{n}_{2}}\,}\]

A parallel plate air capacitor has capacity C distance of separation between plates is d and potential difference V is applied between the plates. Force of attraction between the plates of the parallel plate air capacitor is [NEET (Re) 2015]

\[\frac{{{C}^{2}}{{V}^{2}}}{2{{d}^{2}}}\]

\[\frac{16{{C}_{1}}}{{{n}_{1}}\,{{n}_{2}}\,}\]

\[\frac{{{C}^{2}}{{V}^{2}}}{2{{d}^{2}}}\]

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