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Q.

An uncharged capacitor C is connected to a battery through a resistance R. Show that by the time the capacitor gets fully charged, the energy dissipated in R is the same as the energy stored in C.

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a

 U/2  

b

U                             

c

 U/3

d

2/3 U 

answer is B.

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Detailed Solution

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Charge supplied by the battery,

q=CV

Energy supplied by the battery,

E=qV=CV2

Energy stored in the capacitor,

U=12CV2

  Energy dissipated across R in the form of heat

=EU=12CV2=U

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