Electromagnetic Induction & Alternating Currents (NEET Physics): Questions 55 - 61 of 121

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Passage

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

In Figure given, there is a conducting loop ABCDEFA, of resistance per unit length placed near a long straight current-carrying wire. The dimensions are shown in the figure. The long wire lies in the plane of the loop. The current in the long wire varies as I = I 0 t.

Conducting loop ABCDEFA

Conducting Loop ABCDEFA

In figure a conducting loop ABCDEFA placed near a long straight current carrying wire.

Question number: 55 (2 of 3 Based on Passage) Show Passage

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

MCQ▾

Question

The heat produced in the loop in time t is

Choices

Choice (4) Response

a.

[μ02πln(a+ll)I0]2at6λ

b.

[μ02πln(2a+ll)I0]2at8λ

c.

[μ02πln(a+ll)I0]2at3λ

d.

[μ02πln(2a+ll)I0]2at4λ

Question number: 56 (3 of 3 Based on Passage) Show Passage

» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance

MCQ▾

Question

The mutual inductance of the pair is

Choices

Choice (4) Response

a.

2μ0aπln(a+ll)

b.

μ0aπln(a+ll)

c.

μ0a2πln(2all)

d.

μ0a2πln(2a+ll)

Question number: 57

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

MCQ▾

Question

A step-down transformer is used on a 1000 V line to deliver 20 A at 120 V at the secondary coil. If the efficiency of the transformer is 80%, the current drawn from the line is:

Choices

Choice (4) Response

a.

3 A

b.

2.4 A

c.

30 A

d.

0.3 A

Passage

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

If the voltage in an a c circuit is represented by the eq. , V=2202sin(314tΦ) , then

Question number: 58 (1 of 3 Based on Passage) Show Passage

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

MCQ▾

Question

RMS value of the voltage is

Choices

Choice (4) Response

a.

2002V

b.

314 V

c.

2202V

d.

220 V

Question number: 59 (2 of 3 Based on Passage) Show Passage

» Electromagnetic Induction & Alternating Currents » Alternating Currents

MCQ▾

Question

Frequency of ac is

Choices

Choice (4) Response

a.

502Hz

b.

50 Hz

c.

75 Hz

d.

503Hz

Question number: 60 (3 of 3 Based on Passage) Show Passage

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

MCQ▾

Question

Average voltage is

Choices

Choice (4) Response

a.

2002V

b.

2202V

c.

622πV

d.

220 V

Question number: 61

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

Question

One 10 V, 60 W bulb is to be connected to 100 V line. The required induction coil has self-inductance of value (f = 50Hz)

Choices

Choice (4) Response

a.

0.052 H

b.

16.2 mH

c.

2.42 H

d.

1.62 mH

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