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)  2C1n1n2              (b) 16n2n1C1

(c)  2n2n1C1            (d)  16C1n1n2

 

   Case I. When the capacitors are joined in series

              Useries =  12C1n1 (4V)2

 

  Case II.  When the capacitors are joined in parallel

             Uparallel 12(n2C2)V2

Given, Useries= Uparallel

or 12C1n1(4V)212(n2C2)V2

         C216C1n2n1

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