NEET Physics: Questions 730 - 735 of 2098

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Question number: 730

» Electromagnetic Induction & Alternating Currents » Faraday's Law

MCQ▾

Question

A copper disc of radius 0.1 m rotates about its center with 10 revolution per second in a uniform magnetic field of 0.1 T. The emf induced across the radius of the disc is –

Choices

Choice (4) Response

a.

20πmV

b.

π10V

c.

10πmV

d.

2π10V

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: 731 (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)

Question number: 732 (2 of 3 Based on Passage) Show Passage

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

MCQ▾

Question

After some time the rod will approach a terminal speed. The speed is,

Choices

Choice (4) Response

a.

E2BL

b.

2EBL

c.

EBL

d.

32EBL

Question number: 733 (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: 734

» Kinematics » Uniformly Accelerated Motion

MCQ▾

Question

A force produces acceleration 1, ½, 1/3, ¼… (All in m/s2), applied separetly to n bodies. If these bodies are combined to form single one, then the acceleration of the system will be, if same force is taken into account.

Choices

Choice (4) Response

a.

2n(n+1)

b.

n22

c.

2n2(n+1)2

d.

n2

Question number: 735

» Experimental Skills » Vernier Callipers

MCQ▾

Question

Two bodies of masses 2 kg and 4 kg are moving with velocities 5 m/s and 8 m/s respectively along same direction. Then the velocity of their center of mass will be

Choices

Choice (4) Response

a.

5.25 m/s

b.

8.1 m/s

c.

7.3 m/s

d.

6.4 m/s

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