Magnetic Materials & Magnets Test

Question 1
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Which of the following statements about earth 's magnetism is correct

A
The earth behaves as a magnet with the magnetic field pointing approximately from the geographic south-west to the north-east.

B
The earth behaves as a magnet with the magnetic field pointing approximately from the geographic south-east to the north-west.

C
The earth behaves as a magnet with the magnetic field pointing approximately from the geographic east to the west.

D
The earth behaves as a magnet with the magnetic field pointing approximately from the geographic south to the north.

Question 2
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magnetic permeability of the substance μ is

A
μ₀ μ^r

B
μ₀^0.8 μ_r

C
μ₀^1.2 μ_r

D
μ₀^1.5 μ_r

Question 3
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A toroid wound with 60.0 turns/m of wire carries a current of 5.00 A. The torus is iron, which has a magnetic permeability of μm=5000 μ0 under the given conditions. H and B inside the iron are

A
340AT/m,2.88T

B
340AT/m,1.88T

C
380AT/m,1.98T

D
300AT/m,1.88T

Question 4
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A bar magnet of magnetic moment 1.5 J/T lies aligned with the direction of a uniform magnetic field of 0.22 T. What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment opposite to the field direction?

A
0.66J

B
0.76J nC

C
0.86J

D
0.56J

Question 5
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In the magnetic meridian of a certain place, the horizontal component of the earth ’s magnetic field is 0.26G and the dip angle is 60^o . What is the magnetic field of the earth at this location

A
0.65G

B
0.62G

C
0.58G

D
0.52G

Question 6
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Which of the following statements about bar magnets is correct ?

A
We can isolate the north and south pole of a bar magnet.

B
North Pole atrracts North Pole.

C
South Pole atrracts South Pole.

D
We cannot isolate the north and south pole of a bar magnet.

Question 7
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Magnetic material differences are explained by

A
atoms contain moving electrons, and these electrons form microscopic current loops that produce magnetic fields of their own.

B
number of neutrons

C
number of protonsatoms contain spinning electrons, and their spin forms microscopic current loops that produce magnetic

D
fields

Question 8
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A cube-shaped permanent magnet is made of a ferromagnetic material with a magnetization 500M of about The side length is 20 cm. Magnetic dipole moment of the magnet is.

A
5Am²

B
3Am²

C
4Am²

D
6Am²

Question 9
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A bar magnet of magnetic moment 1.5 J/T lies perpendicular to the direction of a uniform magnetic field of 0.22 T. What is the torque acting on it?

A
0.23J

B
0.38J

C
0.43J

D
0.33J

Question 10
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A short bar magnet placed in a horizontal plane has its axis aligned along the magnetic north-south direction. Null points are found on the axis of the magnet at 14 cm from the centre of the magnet. The earth ’s magnetic field at the place is 0.36 G and the angle of dip is zero. What is the total magnetic field on the normal bisector of the magnet at the same distance as the null –point (i.e., 14 cm) from the centre of the magnet? (At null points, field due to a magnet is equal and opposite to the horizontal component of earth ’s magnetic field.)

A
0.64 G in the direction of earth ’s field.

B
0.62 G in the direction of earth ’s field.

C
0.54 G in the direction of earth ’s field.

D
0.58 G in the direction of earth ’s field.

Submit Test

Magnetic Materi...

Question 1

The earth behaves as a magnet with the magnetic field pointing approximately from the geographic south-west to the north-east.

The earth behaves as a magnet with the magnetic field pointing approximately from the geographic south-east to the north-west.

The earth behaves as a magnet with the magnetic field pointing approximately from the geographic east to the west.

The earth behaves as a magnet with the magnetic field pointing approximately from the geographic south to the north.

Question 2

μ0 μr

μ00.8 μr

μ01.2 μr

μ01.5 μr

Question 3

340AT/m,2.88T

340AT/m,1.88T

380AT/m,1.98T

300AT/m,1.88T

Question 4

0.66J

0.76J nC

0.86J

0.56J

Question 5

0.65G

0.62G

0.58G

0.52G

Question 6

We can isolate the north and south pole of a bar magnet.

North Pole atrracts North Pole.

South Pole atrracts South Pole.

We cannot isolate the north and south pole of a bar magnet.

Question 7

atoms contain moving electrons, and these electrons form microscopic current loops that produce magnetic fields of their own.

number of neutrons

number of protonsatoms contain spinning electrons, and their spin forms microscopic current loops that produce magnetic

fields

Question 8

5Am2

3Am2

4Am2

6Am2

Question 9

0.23J

0.38J

0.43J

0.33J

Question 10

0.64 G in the direction of earth ’s field.

0.62 G in the direction of earth ’s field.

0.54 G in the direction of earth ’s field.

0.58 G in the direction of earth ’s field.

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Question Analysis

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μ₀ μ^r

μ₀^0.8 μ_r

μ₀^1.2 μ_r

μ₀^1.5 μ_r

5Am²

3Am²

4Am²

6Am²