Electromagnetic Induction & Alternating Currents (NEET Physics): Questions 100 - 102 of 121

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Question number: 100

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

MCQ▾

Question

An alternating emf of frequency υ=12πLC is applied to a series LCR circuit. For this frequency of the applied emf is,

Choices

Choice (4) Response

a.

The circuit is at resonance and its impedance is made up only of a reactive part.

b.

The current in the circuit is not in phase with the applied e. m. f. and the voltage across R equals this applied emf

c.

The sum of the potential differences across the inductance and capacitance equals the applied e. m. f. which is 180° ahead of phase of the current in the circuit

d.

The quality factor of the circuit is ωLR or 1ωCT and this is a measure of the voltage magnification (produced by the circuit at resonance) as well as the sharpness of resonance of the circuit.

Question number: 101

» Electromagnetic Induction & Alternating Currents » Resonance

MCQ▾

Question

The resonant frequency of a circuit is f. If the capacitance is made 4 times the initial values, then the resonance frequency will become

Choices

Choice (4) Response

a.

f2

b.

f

c.

174

d.

Both a. and c. are correct

Question number: 102

» Electromagnetic Induction & Alternating Currents » Power in AC Circuits

MCQ▾

Question

If a current I given by I0sin(ωtπ2) flows in an ac circuit across which an ac potential of E=E0sinωt has been applied, then the average power consumption P in the circuit will be

Choices

Choice (4) Response

a.

P=E0I02

b.

P=2E0I0

c.

P=0

d.

P=E0I02

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