Electromagnetic Induction & Alternating Currents (NEET Physics): Questions 111 - 116 of 121

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Question number: 111

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

MCQ▾

Question

In a circuit L, C and R are connected in series with an alternating voltage source of frequency f. The current leads the voltage by 45°. The value of C is

Choices

Choice (4) Response

a.

1πf(2πfL+R)

b.

1πf(2πfLR)

c.

12πf(2πfL+R)

d.

12πf(2πfLR)

Question number: 112

» Electromagnetic Induction & Alternating Currents » Resonance

MCQ▾

Question

The power factor of LCR circuit at resonance is

Choices

Choice (4) Response

a.

Zero

b.

1

c.

0.5

d.

0.707

Question number: 113

» Electromagnetic Induction & Alternating Currents » Resonance

MCQ▾

Question

The phase difference between the current and voltage of LCR circuit in series combination at resonance is

Choices

Choice (4) Response

a.

b.

π

c.

d.

π2

Question number: 114

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

MCQ▾

Question

In a series LCR circuit capacitance is changed from C to 2C. For the resonant frequency to remain unchanged, the inductance would be changed from L to

Choices

Choice (4) Response

a.

L4

b.

L2

c.

2 L

d.

4 L

Question number: 115

» Electromagnetic Induction & Alternating Currents » Resonance

MCQ▾

Question

In the non-resonant circuit, what will be the nature of the circuit for frequencies higher than the resonant frequency?

Choices

Choice (4) Response

a.

Resistive

b.

Capacitive

c.

Inductive

d.

All of the above

Question number: 116

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

MCQ▾

Question

For series LCR circuit, correct statements are

(1) Applied e. m. f. and potential difference across resistance may be in phase

(2) Applied e. m. f. and potential difference at inductor coil have phase difference of π/2

(3) Potential difference across resistance and capacitor have phase difference of π/2

(4) Potential difference at capacitor and inductor have phase difference of π/2

Select the correct answers and mark it according to the following codes:

Codes:

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

2 and 4 are correct

c.

1, 2 and 3 are correct

d.

1 and 2 are correct

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