Electromagnetic Induction & Alternating Currents (NEET Physics): Questions 85 - 90 of 121

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Question number: 85

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

Question

An alternating voltage is connected in series with a resistance R and an inductance L. If the potential drop across the resistance is 200 V and across the inductance is 150 V, then the applied voltage is

Choices

Choice (4) Response

a.

500 V

b.

350 V

c.

250 V

d.

300 V

Question number: 86

» Electromagnetic Induction & Alternating Currents » Peak and RMS Value of AC

MCQ▾

Question

The resistance of a coil for dc is 5 ohm. In ac, the resistance will

Choices

Choice (4) Response

a.

Increase

b.

Decrease

c.

Be zero

d.

Remain same

Passage

Read the passage given below and answer the questions that follow:

A student constructs a series RLC circuit. While operating the circuit at a frequency f she uses an AC voltmeter and measures the potential difference across each device as (∆V R) = 8.8 V, (∆V L) = 2.6V and (∆V C) = 7.4V.

Question number: 87 (1 of 3 Based on Passage) Show Passage

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

MCQ▾

Question

What result should the student expect for a measurement of the amplitude E m of the potential difference across the power supply?

Choices

Choice (4) Response

a.

18.8 V

b.

13.6 V

c.

4.0 V

d.

10.0 V

Question number: 88 (2 of 3 Based on Passage) Show Passage

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

MCQ▾

Question

The circuit is constructed so that the inductor is next to the capacitor. What result should the student expect for a measurement of the combined potential difference (∆V L + ∆V C) across the inductor and capacitor?

Choices

Choice (4) Response

a.

10.0 V

b.

4.8 V

c.

7.4 V

d.

7.8 V

Question number: 89 (3 of 3 Based on Passage) Show Passage

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

MCQ▾

Question

What will happen to the value of ( ∆V L) if the frequency is adjusted to increase the current through the circuit?

Choices

Choice (4) Response

a.

(∆V L) will remain the same regardless of any changes to f.

b.

There is not enough information to answer the question.

c.

(∆V L) will increase.

d.

(∆V L) will decrease.

Question number: 90

» Electromagnetic Induction & Alternating Currents » Alternating Currents

Assertion-Reason▾

Assertion (Ꭺ)

A sinusoidal alternating current does not show any magnetic effects.

Reason (Ꭱ)

The average value of alternating current is zero.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is true but Ꭱ is false

d.

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

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