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Question 12: NCERT Solutions for 12th Class Physics: Chapter 7-Alternating Current

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Question 12: NCERT Solutions for 12th Class Physics: Chapter 7-Alternating Current

An LC circuit contains a 20 mH inductor and a 50 μF capacitor with initial charge of 10 mC. The resistance of the circuit in negligible. Let the instant the circuit is closed be t = 0.
(a) What is the total energy stored initially? Is it conserved during LC oscillations?
(b) What is the natural frequency of the circuit?
(c) At what time is the energy stored

  • completely electrical (i.e., stored in the capacitor)?
  • completely magnetic (i.e., stored in the inductor)?

(d) At what times is the total energy shared equally between the inductor and capacitor?
(e) If a resistor is inserted in the circuit, how much energy is eventually dissipated as heat?

 

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