NEET Physics: Questions 611 - 616 of 2099

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Question number: 611

» Magnetic Effects of Current and Magnetism » Electric Charge Moving in Magnetic Field

MCQ▾

Question

An electron is revolving in a circular path of radius 2 x l0 -10 m with a speed of 3 x l0 6 m/s. The magnetic field at the center of circular path will be

Choices

Choice (4) Response
a.

0

b.

1.2 T

c.

2.4 T

d.

3.6 T

Passage

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

A telephone cable at a place has four long, straight horizontal wires carrying a current of 1.0 A in the same direction east to west. The earth’s magnetic field at the place is 0.39 Gauss, and the angle of dip is 35°. The magnetic declination is nearly zero, (cos 35° = 0.82, sin 35° = 0.57)

Question number: 612 (1 of 3 Based on Passage) Show Passage

» Magnetic Effects of Current and Magnetism » Earth's Magnetic Field

MCQ▾

Question

The magnetic field produced by four current carrying straight cable wires at a distance 4 cm is

Choices

Choice (4) Response
a.

0.3 Gauss

b.

0.2 Gauss

c.

0.5 Gauss

d.

0.4 Gauss

Question number: 613 (2 of 3 Based on Passage) Show Passage

» Magnetic Effects of Current and Magnetism » Earth's Magnetic Field

MCQ▾

Question

The resultant magnetic fields below at points 4cm and above the cable are

Choices

Choice (4) Response
a.

0.25, 0.56 Gauss

b.

0.23, 0.34 Gauss

c.

0.14, 0.32 Gauss

d.

0.52, 0.62 Gauss

Question number: 614 (3 of 3 Based on Passage) Show Passage

» Magnetic Effects of Current and Magnetism » Earth's Magnetic Field

MCQ▾

Question

The angle that resultant makes with horizontal in case below and above the cable respectively, are

Choices

Choice (4) Response
a.

sin10.7,sin10.9

b.

30°, 45°

c.

tan11.8,tan10.43

d.

tan12,tan12

Question number: 615

» Magnetic Effects of Current and Magnetism » Electric Charge Moving in Magnetic Field

MCQ▾

Question

An α-particle is describing a circle of radius 0.45 m in a field of magnetic induction 1.2 weber/m 2. The potential difference required to accelerate the particle, (The mass of a-particle is 6.8 x 10 -27 kg and its charge is 3.2 x 10 -19 coulomb. ) will be

Choices

Choice (4) Response
a.

2.3 x 10 -12 V

b.

6 x 10 6 V

c.

7 x 10 6 V

d.

3.2 x 10 -12 V

Question number: 616

» Magnetic Effects of Current and Magnetism » Electric Charge Moving in Magnetic Field

MCQ▾

Question

If an α-particle moving with velocity V enters perpendicular to a magnetic field then the magnetic force acting on it will be

Choices

Choice (4) Response
a.

2evB

b.

4evB

c.

0

d.

evB

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