Alternating Current. LC Circuits Practice Questions

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16.14Alternating Current. LC Circuits

Alternating Current. LC Circuits Revision Questions

1) The average current flowing through a LC circuit is 4A and the solenoid has an inductance of 0.005H. What is the energy stored in the circuit during one cycle if the frequency of electricity is 50Hz?

  1. 0.04 J
  2. 0.004 J
  3. 0.0004 J
  4. 4 J

Correct Answer: A

2) The maximum current in a 60Hz circuit is 12A. What is the magnitude of current 5.6s after the switch is turned on if the initial phase is φ0 = 30°?

(30° = π/6 rad; cos 30° = √3/2; sin 30° = 1/2)

  1. 6A
  2. 6√3 A
  3. 0A
  4. 12 A

Correct Answer: A

3) The maximum potential difference in a 50 Hz LC circuit is 5V. What is the potential difference across the capacitor at t = 11.927 s if the initial phase is φ0 = 0?

  1. 0V
  2. 3V
  3. 4V
  4. 5V

Correct Answer: C

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