Electrostatic Potential and Capacitance - Result Question 47

49. A 4μF conductor is charged to 400 volts and then its plates are joined through a resistance of 1kΩ. The heat produced in the resistance is

(a) 0.16J

(b) 1.28J

(c) 0.64J

(d) 0.32J

[1989]

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Answer:

Correct Answer: 49. (d)

Solution:

  1. (d) The energy stored in the capacitor

=12CV2=12×4×106×(400)2=0.32J

This energy will be converted into heat in the resistor.

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