Electromagnetic Induction & Alternating Currents (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 99 - 101 of 124

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Question number: 99

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

MCQ▾

Question

For the series LCR circuit shown in the figure, what is the resonance frequency and the amplitude of the current at the resonating frequency

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 100

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

MCQ▾

Question

An alternating emf of frequency 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 or 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.

b.

f

c.

174

d.

Both a. and c. are correct

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