Magnetic Effects of Current and Magnetism-Earth's Magnetic Field (NEET Physics): Questions 1 - 5 of 6

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Question number: 1

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

Assertion-Reason▾

Assertion (Ꭺ)

A compass needle when placed on the magnetic north pole of the earth cannot rotate in vertical direction.

Reason (Ꭱ)

The earth has only horizontal component of its magnetic field at the north poles.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

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: 2 (1 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: 3 (2 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: 4 (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: 5

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

MCQ▾

Question

A long straight horizontal cable carries a current of 2.5 A in the direction 10° south of west to 10° north of east. The magnetic meridian of the place happens to be 10° west of the geographic meridian. The earth’s magnetic field at the location is 0.33 Gauss, and the angle of dip is zero. Distance of the line of neutral points from the cable is, (Ignore the thickness of the cable).

Choices

Choice (4) Response

a.

3.5 cm

b.

2.0 cm

c.

2.5 cm

d.

1.5 cm

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