Q145 / 155 · WBJEE 2018 · Physics

An electric bulb, a capacitor, a battery and a switch are all in series in a circuit. How does the intensity of light vary when the switch is turn on?

  • A
    Continues to increase gradually
  • B
    Gradually increases for sometime and then becomes steady
  • Correct answer
    C
    Sharply rises initially and then gradually decreases
  • D
    Gradually increases for sometime and then gradually decreases

Solution

Initially, there will be no voltage drop across capacitor, so intensity of bulb will rise sharply and gradually voltage drop across capacitor will increase as a result voltage drop across bulb decreases, so intensity of bulb will decreases.

Hence, the correct answer is option: 'C'.

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