NEET Physics: Questions 625 - 628 of 2098

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Question number: 625

» Magnetic Effects of Current and Magnetism » Moving Coil Galvanometer

MCQ▾

Question

The pole pieces of the magnet used in a pivoted coil galvanometer are

Choices

Choice (4) Response

a.

Plane surfaces of a horse-shoe magnet

b.

Cylindrical surfaces of a bar magnet

c.

Plane surfaces of a bar magnet

d.

Cylindrical surfaces of a horse-shoe magnet

Question number: 626

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

MCQ▾

Question

At certain location in the northern hemisphere, the earth’s magnetic field has a magnitude of 42 μT and points down ward at 57° to vertical. The flux through a horizontal surface of area 2.5 m 2 will be- (Given cos 33° = 0.839, cos 57° = 0.545)

Choices

Choice (4) Response

a.

57 x 10 -6 Wb/m 2

b.

42 x 10 -6 Wb/m 2

c.

41 x 10 -6 Wb/m 2

d.

56 x 10 -6 Wb/m 2

Question number: 627

» Magnetic Effects of Current and Magnetism » Ampere's Law

MCQ▾

Question

If a coil carrying current is placed in uniform magnetic field, then

(1) emf is produced

(2) torque is produced

(3) force is produced

(4) torque is not produced

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

Choices

Choice (4) Response

a.

1 and 2 are correct

b.

1 and 3 are correct

c.

2 and 4 are correct

d.

1, 2 and 3 are correct

Question number: 628

» Magnetic Effects of Current and Magnetism » Biot - Savart Law

MCQ▾

Question

Consider the loop PQRSP, carrying clockwise current i, shown in the figure. The magnitude of magnetic field at the center O of the curved portion is

The loop PQRSP, carrying clockwise current i

The Loop PQRSP, Carrying Clockwise Current I

Here in figure loop PQRSP is current carrying in clockwise direction. O is the center of this loop.

Choices

Choice (4) Response

a.

0

b.

μ0i2πr

c.

μ0i2πr(π+tan)

d.

μ0i2πr(π+tan)

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