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Standard XII

Physics

RMS Value

An LC circuit...

Question

An LC circuit contains a 20 mH inductor and a $50 μ F$ capacitor with an initial charge of 10 mC. The resistance of the circuit is negligible. Let the instant the circuit is closed is at t = 0. At what time is the energy stored completely magnetic?

t = 0

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t = 1.57 ms

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t = 3.14 ms

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t = 6.28 ms

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Solution

The correct option is B t = 1.57 ms
$t = \frac{T}{4} \sqrt{L C}$

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An LC circuit contains a 20 mH inductor and a 50 μF capacitor with an initial charge of 10 mC. The resistance of the circuit is 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?

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

(d) At what times is the total energy shared equally between the inductor and the capacitor?

(e) If a resistor is inserted in the circuit, how much energy is eventually dissipated as heat?

Q. An LC circuit contains a 20 mH inductor and a 50

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(b) What is the natural frequency of the
circuit?

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

(ii) completely magnetic (i.e. stored in the inductor)?

(d) At what times is the total energy shared
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An LC circuit contains a 20 mH inductor and a 50μF capacitor with an initial charge of 10 mC. The resistance of the circuit is negligible. Let the instant the circuit is closed is at t = 0. At what time is the energy stored completely magnetic?

The correct option is B t = 1.57 mst=T4√LC

An LC circuit contains a 20 mH inductor and a $50 μ F$ capacitor with an initial charge of 10 mC. The resistance of the circuit is negligible. Let the instant the circuit is closed is at t = 0. At what time is the energy stored completely magnetic?

The correct option is B t = 1.57 ms
$t = \frac{T}{4} \sqrt{L C}$