A series combination of n1 capacitors, each of value C1,

A series combination of n₁ capacitors, each of value C₁, is charged by a source of potential difference 4 V. When another parallel combination of n₂ capacitors, each of value C₂, 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 C₂ , in terms of C₁, is then

In series, C_eff =	C₁
	n₁

∴ Energy stored, E_s =	1	C_eff C₂² =	1	C₁	16V²
	2		2	n₁

= 8V²	C₁
	n₁

In parallel, C_eff = n₂ C₂

Energy stored, E_p =	2	n₂C₂V²
	2

∴	8V²C₁	=	1	= n₂C₂V²
	n₁		2

⇒ C₂ =	16C₁
	n₁n₂