Magnetism and Matter Test 33

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Magnetism and Matter Test 33

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Weekly Quiz Competition

Question 1
1 / -0

The magnetic susceptibility is negative for

A
Paramagnetic materials only

B
Diamagnetic material only

C
Ferromagnetic materials only

D
paramagnetic and ferromagnetic materials

Solution

Given: Magnetic susceptibility=-ve
Solution: Magnetic susceptibility is the degree to which a material is magnetized.
Diamagnetic substance has negative susceptibility.
Negative magnetic susceptibility mean that the magnetization (M) is repelling in nature so they move from stronger to weaker region.
Hence the correct option is B
Question 2
1 / -0

The $$\chi-(\dfrac{1}{T})$$ graph for an alloy of paramagnetic nature is shown in figure. The curie constant is, then

A
$$57\ K$$

B
$$2.8 \times 10^{-3} K$$

C
$$570\ K$$

D
$$17.5 \times 10^{-3} K$$

Solution

$$X = C \times \frac{1}{T} = \dfrac{0.4}{{1 \times {{7}^{ - 3}}}} = 57K$$
Question 3
1 / -0

The susceptibility of a diamagnetic material is

A
directly proportional to $$T$$

B
inversely proportional to $$T $$

C
independent of $$\mathrm { T } $$

D
inversely proportional to $$\mathrm { T } ^ { 2 }$$

Solution

Solution: As we know that$$,$$ On the basis of our
understanding about Diamagnetic material that
susceptibility is independent of the magnetising
field and the temperature.
hence,
The correct opt:C
Question 4
1 / -0

The susceptibility of a paramagnetic substance was found for different temperatures and a graph of $$\chi $$ against $$\frac{1}{T}$$ was plotted. From the graph, it was found that what $$\chi =0.5, \frac{1}{T}=5 \times 10^{-3}/K$$. What is the curie constant for the substance ?

A
50 K

B
75 K

C
100 K

D
125 K

Solution

Curie's law : $$\chi = \dfrac{c}{T}$$
So, $$0.5 =c\times 5\times 10^{-3}$$
$$\implies \ c = 100 \ K$$
Question 5
1 / -0

A conducting wire frame is placed in a magnetic field which is directed in to the paper. The magnetic field increasing at a constant rate. The directions of induced current in wires AB and CD are:

A
B to A and D to C

B
A to B and C to D

C
A to B and D to C

D
B to A and C to D

Solution

$$Solution:$$ Inward magnetic field (')
increasing. Therefore, induced
current in both the loops should be
anticlockwise. But as the area of
loop on right side is more, induced
emf in this will be more compared
to the left side loop

$$\left(e=-\frac{d \varphi}{d t}=-A . \frac{d B}{d t}\right)$$

Therefore net current in the
complete loop will be in a direction
shown above.
$$So,the$$ $$correct$$ $$option:A$$
Question 6
1 / -0

If the magnetic flux linked up with a coil is changed by 40%, the energy storied in the coil changes by

A
21%

B
80%

C
40%

D
96%
Question 7
1 / -0

The intensity of magnetic field is H and moment of magnet is M. The maximum potential energy is

A
MH

B
2 MH

C
3 MH

D
4 MH

Solution

When the magnetic field $$=H$$
and moment of magnet $$=M$$
Now, the maximum potential energy $$=HM$$
when $$\sin{ 90 }^{ 0 }=1$$
Question 8
1 / -0

The mass of a specimen of a ferromagnetic material is $$0.6 kg$$ and its density is $$7.8\times 10^{ { 3 } }{ kg }/{ m }^{ { 3 } }.$$ If the area of hysteresis loop of alternating magnetising field of frequency $$50 { Hz }$$ is $$0.722{ MKS }$$ units then the hysteresis loss per second will be :-

A
$$277.7\times 10^{ { -5 } }{ J }/{ sec }$$

B
$$277.7\times 10^{ { -6 } }{ J }/{ sec }$$

C
$$277.7\times 10^{ { -4 } }{ J }/{ sec }$$

D
$$277.7\times 10^{ { -3 } }{ J }/{ sec }$$

Solution

$$\begin{array}{l} Accorrding\, \, to\, \, question....................... \\ Here, \\ Hysteresis\, energy\, lost\, per\, \, \, second\, \, is: \\ E=nA\frac { m }{ p } =\dfrac { { 50\times 0.722\times 0.6 } }{ { 7.8\times \, { { 10 }^{ 3 } } } } \\ \, \, \, \, \, \, \, \, \, \therefore \, \, \, \, 277.7\times { 10^{ -5 } }J/S \\ So\, the\, correct\, option\, is\, A. \end{array}$$
Question 9
1 / -0

Mark out the correct options.

A
diamagnetism occurs in all materials.

B
diamagnetism results from the partial alignment of permanent magnetic moment.

C
the magnetizing field intensity H is always zero in free space .

D
the magnetic field of unduced magnetic moment is opposite to the applied field.

Solution

Solution :
Diamagnetism is the only contribution of magnetism, it is the quantum mechanical effect that occurs in all materials. In ferromagnetic and paramagnetic substance weak diamagnetic force is present which is overcome by the attractive force of magnetic dipoles present in material.
The Correct Opt:A
Question 10
1 / -0

Magnetic flux in the circuit containing a coil of resistance 2 ohm changes from 2.0 wb to 10 wb in 0.2 sec. the charge passed through the coil in this time is

A
0.8 C

B
1.0 C

C
5.0C

D
4.0C

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Magnetism and Matter Test 33

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Magnetism and Matter Test 33

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Question 1

Paramagnetic materials only

Diamagnetic material only

Ferromagnetic materials only

paramagnetic and ferromagnetic materials

Solution

Question 2

$$57\ K$$

$$2.8 \times 10^{-3} K$$

$$570\ K$$

$$17.5 \times 10^{-3} K$$

Solution

Question 3

directly proportional to $$T$$

inversely proportional to $$T $$

independent of $$\mathrm { T } $$

inversely proportional to $$\mathrm { T } ^ { 2 }$$

Solution

Question 4

50 K

75 K

100 K

125 K

Solution

Question 5

B to A and D to C

A to B and C to D

A to B and D to C

B to A and C to D

Solution

Question 6

21%

80%

40%

96%

Question 7

MH

2 MH

3 MH

4 MH

Solution

Question 8

$$277.7\times 10^{ { -5 } }{ J }/{ sec }$$

$$277.7\times 10^{ { -6 } }{ J }/{ sec }$$

$$277.7\times 10^{ { -4 } }{ J }/{ sec }$$

$$277.7\times 10^{ { -3 } }{ J }/{ sec }$$

Solution

Question 9

diamagnetism occurs in all materials.

diamagnetism results from the partial alignment of permanent magnetic moment.

the magnetizing field intensity H is always zero in free space .

the magnetic field of unduced magnetic moment is opposite to the applied field.

Solution

Question 10

0.8 C

1.0 C

5.0C

4.0C

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