Magnetic Effects of Current and Magnetism Test

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Magnetic Effects of Current and Magnetism Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

In which case of comparing solenoid and bar magnet there is no exact similarity?

A
flux lines enter one end of a solenoid

B
there is a current entering and a current leaving a solenoid

C
moving a small compass needle in the neighbourhood of a solenoid enables tracing the flux lines

D
solenoid can be broken into two weaker solenoids

Solution

The solenoid will change the field direction and the magnetic pole polarity as current direction is changed. But, the bar magnet will always have same poles, and it does not change.
Question 2
1 / -0

A bar magnet of magnetic moment 2.0 JT^-1 lies aligned with the direction of a uniform magnetic field of 0.25 T. What is the work done to turn the magnet so as to align its magnetic moment opposite to the field direction?

A
0.25 J

B
0.5 J

C
0.75 J

D
1.0 J
Question 3
1 / -0

A paramagnetic substance of susceptibility 3 x 10^-4 is placed in a magnetic field of 4 x 10^-4 Am^-1. What is the intensity (in Am^-1) of magnetisation?

A
1.33 x 10⁸

B
0.75 x 10^-8

C
12 x 10^-8

D
14 x 10^-8
Question 4
1 / -0

For a paramagnetic material, the dependence of magnetic susceptibility X on absolute temperature T is given by (C is a constant)

A
X = CT

B
X = C/T

C
X = CT²

D
X = C/T^–2
Question 5
1 / -0

The relative permeability of iron is of the order

A
zero

B
1

C
10^–4

D
10³
Question 6
1 / -0

Which of the following statements about bar magnets is correct ?

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

B
North Pole atrracts North Pole.

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

D
South Pole atrracts South Pole.

Solution

As magnetic monopole does not exist. If we split the bar magnet into two pieces each part will have its own north and south pole.
Question 7
1 / -0

The magnetic susceptibility of a material of a rod is 449. Permeability of vacuum is 4π x 10^-7 henry/metre. The absolute permeability of the material of the rod (in henry/metre) is

A
π x 10^-4

B
2π x 10^-4

C
3π x 10^-4

D
4π x 10^-4
Question 8
1 / -0

If a bar magnet of pole strength q and magnetic moment m is divided into two equal pieces by cutting it perpendicular to its length, then

A
q is halved and m is doubled

B
q and m both are halved

C
q is halved, but m remains the same

D
q remains the same, but m is halved
Question 9
1 / -0

A small piece of a material is repelled by a strong magnet. The material is

A
paramagnetic

B
ferromagnetic

C
diamagnetic

D
non-magnetic

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Magnetic Effects of Current and Magnetism Test - 1

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Magnetic Effects of Current and Magnetism Test - 1

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Question 1

flux lines enter one end of a solenoid

there is a current entering and a current leaving a solenoid

moving a small compass needle in the neighbourhood of a solenoid enables tracing the flux lines

solenoid can be broken into two weaker solenoids

Solution

Question 2

0.25 J

0.5 J

0.75 J

1.0 J

Question 3

1.33 x 108

0.75 x 10-8

12 x 10-8

14 x 10-8

Question 4

X = CT

X = C/T

X = CT2

X = C/T–2

Question 5

zero

1

10–4

103

Question 6

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

North Pole atrracts North Pole.

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

South Pole atrracts South Pole.

Solution

Question 7

π x 10-4

2π x 10-4

3π x 10-4

4π x 10-4

Question 8

q is halved and m is doubled

q and m both are halved

q is halved, but m remains the same

q remains the same, but m is halved

Question 9

paramagnetic

ferromagnetic

diamagnetic

non-magnetic

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1.33 x 10⁸

0.75 x 10^-8

12 x 10^-8

14 x 10^-8

X = CT²

X = C/T^–2

10^–4

10³

π x 10^-4

2π x 10^-4

3π x 10^-4

4π x 10^-4