NEET Physics: Questions 760 - 764 of 2099

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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: 760 (1 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: 761 (2 of 3 Based on Passage) Show Passage

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

MCQ▾

Question

The e. m. f. induced in the closed loop is

Choices

Choice (4) Response
a.

μ0I0a2πln(2a+ll)

b.

μ0I0a2πln(2all)

c.

μ0I0aπln(a+ll)

d.

2μ0I0aπln(a+ll)

Question number: 762 (3 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: 763

» 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

Question number: 764

» Experimental Skills » Vernier Callipers

MCQ▾

Question

A 4 kg body and a 3 kg body are moving along the x-axis. At a particular instant the 2 kg body has a velocity of 3 ms -1 and the 3 kg body has the velocity of 2ms -1. The velocity of the center of mass at that instant is

Choices

Choice (4) Response
a.

5 ms -1

b.

1 ms -1

c.

2.57

d. None of the above

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