# NEET Physics Current Electricity Questions Solved

NEET - 2010

A series combination of n1 capacitors, each of value C1, is charged by a source of potential difference 4V. 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

(a)  $\frac{2{C}_{1}}{{n}_{1}{n}_{2}}$              (b) 16$\frac{{n}_{2}}{{n}_{1}}$C1

(c)  2$\frac{{n}_{2}}{{n}_{1}}$C1            (d)  $\frac{16{C}_{1}}{{n}_{1}{{n}_{2}}_{}}$

Case I. When the capacitors are joined in series

Useries =  $\frac{1}{2}$$\frac{{C}_{1}}{{n}_{1}}$ (4V)2

Case II.  When the capacitors are joined in parallel

Uparallel $\frac{1}{2}$(n2C2)V2

Given, Useries= Uparallel

or $\frac{1}{2}$$\frac{{C}_{1}}{{n}_{1}}$(4V)2$\frac{1}{2}$(n2C2)V2

$⇒$         C2$\frac{16{C}_{1}}{{n}_{2}{n}_{1}}$

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