Electromagnetic Induction & Alternating Currents-Induced EMF and Current (NEET Physics): Questions 1 - 4 of 12

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Question number: 1

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

MCQ▾

Question

A closed coil consists of 500 turns on a rectangular frame of area 4.0 cm 2 and has a resistance of 50 ohm. The coil is kept with its plane perpendicular to a uniform magnetic field of 0.2 weber/meter 2. The amount of charge flowing through the coil if it is turned over (rotated through 180°) will be -

Choices

Choice (4) Response

a.

1.6 x 10 -19 C

b.

1.6 x 10 -9 C

c.

1.6 x 10 -2 C

d.

1.6 x 10 -3 C

Question number: 2

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

MCQ▾

Question

A closed coil of copper whose area is lm × lm is free to rotate about an axis. The coil is placed perpendicular to a magnetic field of 0.10 Wb/m 2. It is rotated through 180° in 0.01 second. Then (The resistance of the coil is 2.0Ω)

(1) The induced e. m. f. in the coil is 20 V

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

(3) The induced e. m. f. in the coil is 10 V

(4) The induced current in the coil is 20 A

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

Choices

Choice (4) Response

a.

1 and 2 are correct

b.

2 and 4 are correct

c.

1 and 3 are correct

d.

1, 2 and 3 are correct

Question number: 3

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

MCQ▾

Question

The current in a coil varies with respect to time t as I = 3t 2 + 2t. If the inductance of coil be 10 mH, the value of induced e. m. f. at t = 2 sec will be,

Choices

Choice (4) Response

a.

0.11 V

b.

0.14 V

c.

0.13 V

d.

0.12 V

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: 4 (1 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)

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