Electromagnetic Induction & Alternating Currents-Induced EMF and Current (NEET Physics): Questions 5 - 9 of 12

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 2098 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 550.00 or

Passage

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

In the figure shown, the rod has a resistance R, the horizontal rails have negligible friction. Magnetic field of intensity B is directed perpendicular into the plane of paper. A cell of e. m. f. E and negligible internal resistance is connected between points a and b. The rod is initially at rest.

Rod of resistance R in magnetic field

Rod of Resistance R in Magnetic Field

The rod of resistance R, the horizontal rails has negligible friction. And magnetic field of intensity B is directed perpendicular into the plan of paper.

Question number: 5 (2 of 3 Based on Passage) Show Passage

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

MCQ▾

Question

The velocity of the rod as a function of time t (where τ=mR(BL)2 ) is

Choices

Choice (4) Response

a.

EBL(1etτ)

b.

E2BL(1etτ)

c.

32EBL(1etτ)

d.

EBL(1+etτ)

Question number: 6 (3 of 3 Based on Passage) Show Passage

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

MCQ▾

Question

The current when the rod attains its terminal speed is

Choices

Choice (4) Response

a.

32ER

b.

Zero

c.

2ER

d.

ER

Question number: 7

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

MCQ▾

Question

5.5 x 10 -4 magnetic flux lines are passing through a coil of resistance 10 ohm and number of turns 1000. If the number of flux lines reduces to 5 x 10 -5 in 0.1 sec. Then

(1) The electromotive force induced in the coil is 5V

(2) The electromotive force induced in the coil is 5 x 10 -4 V

(3) The current induced in the coil is 0.5 A

(4) The current induced in the coil is 10 A

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

1, 2 and 3 are correct

c.

2 and 4 are correct

d.

1 and 2 are correct

Question number: 8

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

MCQ▾

Question

A solenoid has an inductance of 50 mH and a resistance of 0.025 Ω. If it is connected to a battery, how long will it take for the current to reach one half of its final equilibrium value?

Choices

Choice (4) Response

a.

1.38 sec

b.

1.38 ms

c.

0.23 sec

d.

1.34 sec

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: 9 (1 of 2 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)

Sign In