Physics-
General
Easy

Question

Two capacitors C1 and C2 are charged to same potential V, but with opposite polarity as shown in the figure. The switch S1 and S2 are then closed

  1. p.d. across two capacitors are same and is given by fraction numerator open parentheses C subscript 1 end subscript minus C subscript 2 end subscript close parentheses V over denominator C subscript 1 end subscript plus C subscript 2 end subscript end fraction    
  2. p.d. across two capacitors are same and is given by fraction numerator C subscript 1 end subscript V over denominator C subscript 1 end subscript plus C subscript 2 end subscript end fraction    
  3. ratio of final energy to initial energy of the system is given by fraction numerator open parentheses C subscript 1 end subscript minus C subscript 2 end subscript close parentheses to the power of 2 end exponent over denominator open parentheses C subscript 1 end subscript plus C subscript 2 end subscript close parentheses to the power of 2 end exponent end fraction    
  4. ratio of final energy to initial energy of the system is given by fraction numerator open parentheses C subscript 1 end subscript close parentheses to the power of 2 end exponent over denominator open parentheses C subscript 1 end subscript plus C subscript 2 end subscript close parentheses to the power of 2 end exponent end fraction    

The correct answer is: p.d. across two capacitors are same and is given by fraction numerator open parentheses C subscript 1 end subscript minus C subscript 2 end subscript close parentheses V over denominator C subscript 1 end subscript plus C subscript 2 end subscript end fraction

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