Electromagnetic Induction & Alternating Currents-Power in AC Circuits (NEET Physics): Questions 1 - 4 of 6

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Question number: 1

» Electromagnetic Induction & Alternating Currents » Power in AC Circuits

Assertion-Reason▾

Assertion (Ꭺ)

A capacitor of suitable capacitance can be used in an ac circuit in place of the choke coil.

Reason (Ꭱ)

A capacitor blocks dc and allows ac only.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is true but Ꭱ is false

c.

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

d.

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

Question number: 2

» Electromagnetic Induction & Alternating Currents » Power in AC Circuits

Assertion-Reason▾

Assertion (Ꭺ)

For an electric lamp connected in series with a variable capacitor and ac source, its brightness increases with increase in capacitance.

Reason (Ꭱ)

Capacitive reactance decreases with increase in capacitance of capacitor.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

c.

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

d.

Both Ꭺ and Ꭱ are false

Question number: 3

» Electromagnetic Induction & Alternating Currents » Power in AC Circuits

MCQ▾

Question

In an ac circuit, V and I are given by V=100sin(100t)volt ,

I=sin(100t+π3)mA . The average power dissipated in circuit is

Choices

Choice (4) Response

a.

2.5 watt

b.

10 4 watt

c.

10 watt

d.

0.025 watt

Question number: 4

» 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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