# Electromagnetic Induction & Alternating Currents (NEET Physics): Questions 100 - 102 of 124

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## 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

## Question number: 102

» Electromagnetic Induction & Alternating Currents » Power in AC Circuits

MCQ▾

### Question

If a current I given by flows in an ac circuit across which an ac potential of has been applied, then the average power consumption P in the circuit will be

### Choices

Choice (4) Response

a.

b.

c.

d.

f Page