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Question

A capacitor having capacity of 2.0μF is charged to 200 V and then the plates of the capacitors are connected to a resistance wire. The heat produced in joule will be :
  1. 2×102
  2. 4×102
  3. 4×104
  4. 4×1010

A
4×102
B
2×102
C
4×104
D
4×1010
Solution
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Heat produce in a wire is equal to energy stored in capacitor.
H=12CV2
=12×(2×106)×(200)2
=106×200×200
=4×102J.

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