Magnetism and Matter Test

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Magnetism and Matter Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

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 east to the west.

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

C
The earth behaves as a magnet with the magnetic field pointing approximately from the geographic south-east to the north-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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Which of the following statements about bar magnets is correct ?

A
South Pole atrracts South Pole.

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

C
North Pole atrracts North Pole.

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

Solution

Explanation:

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 3
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When iron filings are sprinkled on a sheet of glass placed over a short bar magnet then,

A
The iron filings form a pattern suggesting that the magnet has two poles similar to the positive and negative charge of an electric dipole

B
The iron filings form a random pattern of suggesting that the magnet has random pole

C
The iron filings form a pattern of suggesting that the magnet has south pole similar to the negative charge

D
The iron filings form a pattern of suggesting that the magnet has north pole similar to the positive charge

Solution

Explanation:

North pole act as positive end and South pole act as negative end. The iron fillings in the presence of magnetic field gets magnetized and form a tiny magnet which then gets attracted to the poles of bar magnet. North pole of bar magnet attracts south pole of tiny magnet and vice-versa. So all the iron fillings are arranged as the magnetic field lines of bar magnet.
Question 4
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Which of the following statements about magnetic field lines true?

A
The larger the number of field lines crossing per unit area, the weaker is the magnitude of the magnetic field B.

B
The perpendicular to the field line at a given point gives direction of magnetic field

C
The smaller the number of field lines crossing per unit area, the stronger is the magnitude of the magnetic field B.

D
The magnetic field lines of a magnet (or a solenoid) form continuous closed loops
Question 5
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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
soenoid can be broken into two weaker solenoids

D
moving a small compass needle in the neighbourhood of a solenoid enables tracing the flux lines
Question 6
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Far axial magnetic field of a solenoid as well as bar magnet vary

A
inversely as R cubed R == axial distance to the magnet/solenoid

B
directly as R squared R == axial distance to the magnet/solenoid

C
inversely as R squared R == axial distance to the magnet/solenoid

D
directly as R cubed R == axial distance to the magnet/solenoid
Question 7
1 / -0

According to the dipole analogy 1/ε0 corresponds to

A
μ₀

B
1/μ₀

C
πμ₀

D
2_μ0a
Question 8
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According to Gauss’s law for magnetism

A
The net magnetic flux through any closed surface is zero.

B
The net magnetic flux through any surface is zero.

C
The magnetic flux through any surface is zero.

D
The magnetic flux through any closed surface is zero.

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Magnetism and Matter Test - 1

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Question 1

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-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 south to the north.

Question 2

South Pole atrracts South Pole.

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.

Solution

Question 3

The iron filings form a pattern suggesting that the magnet has two poles similar to the positive and negative charge of an electric dipole

The iron filings form a random pattern of suggesting that the magnet has random pole

The iron filings form a pattern of suggesting that the magnet has south pole similar to the negative charge

The iron filings form a pattern of suggesting that the magnet has north pole similar to the positive charge

Solution

Question 4

The larger the number of field lines crossing per unit area, the weaker is the magnitude of the magnetic field B.

The perpendicular to the field line at a given point gives direction of magnetic field

The smaller the number of field lines crossing per unit area, the stronger is the magnitude of the magnetic field B.

The magnetic field lines of a magnet (or a solenoid) form continuous closed loops

Question 5

flux lines enter one end of a solenoid

There is a current entering and a current leaving a solenoid

soenoid can be broken into two weaker solenoids

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

Question 6

inversely as R cubed R == axial distance to the magnet/solenoid

directly as R squared R == axial distance to the magnet/solenoid

inversely as R squared R == axial distance to the magnet/solenoid

directly as R cubed R == axial distance to the magnet/solenoid

Question 7

μ0

1/μ0

πμ0

2μ0a

Question 8

The net magnetic flux through any closed surface is zero.

The net magnetic flux through any surface is zero.

The magnetic flux through any surface is zero.

The magnetic flux through any closed surface is zero.

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μ₀

1/μ₀

πμ₀

2_μ0a