Multiple choice

A capacitor of 5 µF is charged to a potential difference of 200 V. If it is discharged through two resistors of 700 and 300 ohms in series, what is the energy dissipated in each of the two resistors?

  1. 0.07 J and 0.03 J

  2. 0.03 J and 0.07 J

  3. 9 J and 49 J

  4. 21 J and 21 J

  5. 0.1 J and 0.1 J
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A Correct answer
Explanation

Current in the circuit is given by I2[700+300] = 1/2  x 5 x 10-6  x (200)2 This gives I2 = 0.1 x 103 Hence, H1 = I2 R1 = 0.07 J             H2 = I2 R2 = 0.03 J

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