Magnetism and Matter Test 26

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Magnetism and Matter Test 26

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Weekly Quiz Competition

Question 1
1 / -0

The potential energy of a bar magnet of magnetic moment $$M$$ placed in a magnetic field of magnitude $$B$$ such that it makes an angle $$\theta$$ with the direction of $$B$$ is:

A
$$MB\sin {\theta}$$

B
$$-MB\cos {\theta}$$

C
$$MB(1-\cos {\theta})$$

D
$$MB(1+\cos {\theta})$$

Solution

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Question 2
1 / -0

The primary origin of magnetism lies in the

A
atomic current and intrinsic spin of electrons.

B
polar and non polar nature of molecules.

C
pauli exclusion principle.

D
electronegative nature of materials

Solution

Atomic currents and intrinsic spins of electrons are responsible for origin of magnetism.
Question 3
1 / -0

If $$B_E$$ represents equatorial magnetic field and $$B_A$$ represents axial magnetic field due to a bar magnet. Which of the following relationships between $$B_E$$ and $$B_A$$ is correct?

A
$$B_E = 2 B_A$$

B
$$B_A = 2 B_E$$

C
$$B_E = 4 B_A$$

D
$$B_A = 4 B_E$$

Solution

As equatorial magnetic field due to bar magnet is
$$B_E = \dfrac{\mu_0 m}{4 \pi^3}$$ .....(i)
and axial magnetic field due to bar magnet is
$$B_A = \dfrac{\mu_0}{4 \pi} \dfrac{2m}{r^3} $$ .... (ii)

From (i) and (ii), we get
$$B_A$$ = $$2B_E$$
Question 4
1 / -0

If you made a map of magnetic field lines at Melbourne in Australia, then the magnetic field lines seem to be

A
go into the ground

B
come out of the ground

C
maintain a spiral path on the surface of earth

D
move on helical path above the surface of ground

Solution

As Melbourne is situated in southern hemisphere where north pole of earth's magnetic field lies therefore magnetic lines of force seem to come out of the ground.
Question 5
1 / -0

Mark the correct set of ferromagnetic substances,

A
iron, cobalt and nickel

B
iron, copper and lead

C
silicon, bismuth and nickel

D
aluminium, sodium and copper.

Solution

Iron, cobalt and nickel are the examples of ferromagnetic material.
Question 6
1 / -0

Which of the following property shows the property of ferromagnetic substances?

A
The ferromagnetic property depends on temperature.

B
The ferromagnetic property does not depend on temperature.

C
At high enough temperature ferromagnet becomes a diamagnet

D
At low temperature ferromagnet becomes a paramagnet

Solution

Ferromagnetic material depends on temperature as for $$T<T_{c}(Curie's Temperature)$$ it acts as a ferromagnet.
$$T>T_{c}$$ acts as a paramagnet.
Question 7
1 / -0

The equatorial magnetic field of earth is $$0.4$$G. Then its dipole moment on equator is

A
$$1.05 \times 10^{23} A m^2$$

B
$$2.05 \times 10^{23} A m^2$$

C
$$1.05 \times 10^{21} A m^2$$

D
$$2.05 \times 10^{21} A m^2$$

Solution

Assuming the Earth's magnetic field is due to a bar magnet at center of the Earth, held along the polar axis of Earth, the equatorial magnetic field of Earth is given by
$$B=\dfrac{\mu_0 M}{4\pi r^3}$$

where,
$$r=$$ Radius of earth $$=6400\ km=6.4\times 10^6\ m$$
$$M=$$ Earth's magnetic dipole moment

Given $$B= 0.4\ G= 0.4\times 10^{-4}\ T$$

$$\therefore M=\dfrac{Br^3}{\dfrac{\mu_o}{4\pi}}= \dfrac{(0.4\times 10^{-4})(6.4\times 10^6)^3}{10^{-7}}$$

$$\therefore M=1.05 \times 10^{23} Am^2$$

So, option $$A$$ is correct
Question 8
1 / -0

The strength of the earth's magnetic field is

A
constant everywhere

B
zero everywhere

C
having very high value

D
vary from place to place on the earths surface

Solution

The strength of the earth magnetic field is not constant. It varies from one place to other place on the surface of earth. Its value being of the order of $$10^{-5}$$T.
Question 9
1 / -0

The earth's field departs from its dipole shape substantially at large distance (greater than about $$3000$$ km). The responsible factor for this distortion is then

A
motion of ions in earth's ionosphere

B
motion of ions in earth's atmosphere

C
motion of ions in earth's lithosphere

D
motion of ions in the space.

Solution

Due to motion of ions in earth's ionosphere the earth's magnetic field gets modified.
Question 10
1 / -0

Which of the following is universal magnetic property.?

A
Ferromagnetism

B
Diamagnetism

C
Paramagnetism

D
Anti-ferromagnetism.

Solution

Diamagnetism is universal. It is present in all materials. But it is weak and hard to detect if the substance is para or ferromagnetic

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Magnetism and Matter Test 26

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Magnetism and Matter Test 26

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Question 1

$$MB\sin {\theta}$$

$$-MB\cos {\theta}$$

$$MB(1-\cos {\theta})$$

$$MB(1+\cos {\theta})$$

Solution

Question 2

atomic current and intrinsic spin of electrons.

polar and non polar nature of molecules.

pauli exclusion principle.

electronegative nature of materials

Solution

Question 3

$$B_E = 2 B_A$$

$$B_A = 2 B_E$$

$$B_E = 4 B_A$$

$$B_A = 4 B_E$$

Solution

Question 4

go into the ground

come out of the ground

maintain a spiral path on the surface of earth

move on helical path above the surface of ground

Solution

Question 5

iron, cobalt and nickel

iron, copper and lead

silicon, bismuth and nickel

aluminium, sodium and copper.

Solution

Question 6

The ferromagnetic property depends on temperature.

The ferromagnetic property does not depend on temperature.

At high enough temperature ferromagnet becomes a diamagnet

At low temperature ferromagnet becomes a paramagnet

Solution

Question 7

$$1.05 \times 10^{23} A m^2$$

$$2.05 \times 10^{23} A m^2$$

$$1.05 \times 10^{21} A m^2$$

$$2.05 \times 10^{21} A m^2$$

Solution

Question 8

constant everywhere

zero everywhere

having very high value

vary from place to place on the earths surface

Solution

Question 9

motion of ions in earth's ionosphere

motion of ions in earth's atmosphere

motion of ions in earth's lithosphere

motion of ions in the space.

Solution

Question 10

Ferromagnetism

Diamagnetism

Paramagnetism

Anti-ferromagnetism.

Solution

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