Electromagnetic Induction & Alternating Currents (NEET Physics): Questions 107 - 110 of 124

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Question number: 107

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

Assertion-Reason▾

Assertion (Ꭺ)

When capacitive reactance is smaller than the inductive reactance in LCR current, e. m. f. leads the current.

Reason (Ꭱ)

The phase angle is the angle between the alternating e. m. f. and alternating current of the circuit.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are false

Question number: 108

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

MCQ▾

Question

In a series LCR circuit, resistance R = 10 Ω and the impedance Z = 20 Ω. The phase difference between the current and the voltage is,

Choices

Choice (4) Response

a.

45°

b.

30°

c.

60°

d.

90°

Question number: 109

» Electromagnetic Induction & Alternating Currents » Resonance

MCQ▾

Question

A 10 ohm resistance, 5 mH inductance coil and 10 µF capacitor are joined in series. When a suitable frequency alternating current source is joined to this combination, the circuit resonates. If the resistance is halved, the resonance frequency

Choices

Choice (4) Response

a.

is doubled

b.

is halved

c.

is quadrupled

d.

remains unchanged

Question number: 110

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

Assertion-Reason▾

Assertion (Ꭺ)

Choke coil is preferred over a resistor to adjust current in an ac circuit.

Reason (Ꭱ)

Power factor for inductance is zero.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is false but Ꭱ is true

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