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In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the capacitor when the energy is stored equally between the electric and magnetic field is:

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Important Questions on Alternating Current

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Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>EXERCISE>Q 24
If power factor is 12 in a series RL circuit. R=100 Ω, then L is (f=50 Hz)
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Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>EXERCISE>Q 25
A coil of inductive reactance 31 Ω has a resistance of 8 Ω. It is placed in series with a condenser of capacitive reactance 25 Ω. The combination is connected to an A.C. source of 110 V. The power factor of the circuit is:
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Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>EXERCISE>Q 26
The ratio of secondary to the primary turns in a transformer is 3:2. If the power output be P, then the input power neglecting all losses must be equal to
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Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>EXERCISE>Q 27
An ideal transformer has 100 turns in the primary and 250 turns in the secondary. The peak value of the ac is 28 V. The r.m.s. secondary voltage is nearest to
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Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>EXERCISE>Q 28
The primary and secondary coils of a transformer have 50 and 1500 turns, respectively.  If the magnetic flux ϕ linked with the primary coil is given by ϕ=ϕ0+4t, where ϕ is in weber, t is time, in seconds and ϕ0 is a constant, then the output voltage across the secondary coil is
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Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>EXERCISE>Q 29
The primary winding of a transformer has 500 turns whereas its secondary has 5000 turns. The primary is connected to an A.C. supply of 20 V, 50 Hz. The secondary will have an output of ?
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Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>EXERCISE>Q 30
A step-down transformer is used on a 1000 V line to deliver 20 A at 120 V at the secondary coil. If the efficiency of the transformer is 80%, the current drawn from the line is
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Gamma Question Bank for Medical Physics>Chapter 22 - Alternating Current>EXERCISE>Q 31
A current of 5 A is flowing 220 V in the primary coil of a transformer. If the voltage produced in the secondary coil is 2200 V and 50 % of power is lost, then the current in secondary will be?