Magnetism and Matter Test 37

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Magnetism and Matter Test 37

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Weekly Quiz Competition

Question 1
1 / -0

If 1 A of current is passed through CuSO $$_{4}$$ solution for 10 seconds,then the number of copper ions deposited at the cathode will be about

A
$$1.6\times10 ^{19}$$

B
$$3.1\times10 ^{19}$$

C
$$4.8\times10 ^{19}$$

D
$$6.2\times10 ^{19}$$

Solution

1A of current is passed through the solution for 10 seconds .
Then the total charge supplied $$1\times 10=10C\therefore 2$$ electronic charge $$(3.2\times 10^{-19}C)$$ liberates one $$Cu^{++}$$ $$\therefore $$ Number of $$Cu^{++}$$ ions liberates by 10 C charge $$=\dfrac{1}{3.2\times 10^{-19}}\times 10=3.1\times 10^{19}$$
Question 2
1 / -0

The magnetic susceptibility does not depend upon the temperature in

A
Ferrite substances

B
Ferromagnetic substances

C
Diamagnetic substances

D
Paramagnetic substances

Solution

The magnetic susceptibility does not depend upon the temperature in Diamagnetic substances.
Question 3
1 / -0

The magnetic susceptibility is

A
$$ x = \frac {1}{H} $$

B
$$ x = \frac {B}{H} $$

C
$$ x = \frac {M}{V} $$

D
$$ x = \frac {M}{H} $$

Solution

Magnetic susceptibility is a dimensionless proportionality constant that indicates the degree of magnetization of a material in response to an applied magnetic field. It is caused by interactions of electrons and nuclei with the externally applied magnetic field.
The mathematical definition of magnetic susceptibility is the ratio of magnetization to applied magnetizing field intensity. This is a dimensionless quantity. i.e $$X = \dfrac{M}{H}$$
Question 4
1 / -0

The only property possessed by ferromagnetic substance is

A
Hysteresis

B
Susceptibility

C
Directional property

D
Attracting magnetic substances

Solution

The only property possessed by ferromagnetic substance is Hysteresis.
Question 5
1 / -0

Plane of eddy currents makes an angle with the plane of magnetic lines of force equal to

A
$$40^\circ$$

B
$$0^\circ$$

C
$$90^\circ$$

D
$$180^\circ$$

Solution

Direction of eddy currents is given by Lenz’s rule.
Hence Option C
Question 6
1 / -0

Curies law can be written as

A
$$ X \propto (T-T_c) $$

B
$$ X \propto \frac {1}{ T -T_c} $$

C
$$ X \propto \frac {1}{T} $$

D
$$ X \propto T $$

Solution

The curie law states that in a paramagnetic material, the material's magnetization is directly proportional to an applied magnetic field. This relationship is defined as the Curie's law. The constant $$'C'$$ is called the curie constant. The equation may also be modified to $$χ = C/ (T − θ)$$, where $$θ$$ is a constant.
Question 7
1 / -0

Which of the following statements is incorrect about hysteresis

A
This effect is common to all ferromagnetic substances

B
The hysteresis loop area is proportional to the thermal energy developed per unit volume of the material

C
The hysteresis loop area is independent of the thermal energy developed per unit volume of the material

D
The shape of the hysteresis loop is characteristic of the material

Solution

The energy lost per unit volume of a substance in a complete cycle of magnetisation is equal to the area of the hysteresis loop.
Question 8
1 / -0

Identify the paramagnetic substance

A
Iron

B
Aluminium

C
Nickel

D
Hydrogen

Solution

Aluminium is a paramagnetic substance.
Question 9
1 / -0

The magnetic susceptibility is negative for

A
Paramagnetic materials

B
Diamagnetic materials

C
Ferromagnetic materials

D
Paramagnetic and ferromagnetic materials

Solution

The magnetic susceptibility is negative for Diamagnetic materials.
Question 10
1 / -0

The magnetic potential at a point on the axial line of a bar magnet of dipole moment $$ M $$ is $$ V. $$ What is the magnetic potential due to a bar magnet of dipole moment $$ \frac{M}{4} $$ at the same point

A
$$ 4 V $$

B
$$ 2 V $$

C
$$ \frac{V}{2} $$

D
$$ \frac{V}{4} $$

Solution

Magnetic potential at a distance $$ d $$ from the bar magnet on it's axial line is given by

$$ V=\dfrac{\mu_0}{4 \pi}. \dfrac{M}{d^2} \Rightarrow V \propto M \Rightarrow \dfrac{V_1}{V_2}=\dfrac{M_1}{M_2} $$

$$ \Rightarrow \dfrac{V}{V_2}=\dfrac{M}{M/4} \Rightarrow V_2 = \dfrac{V}{4} $$

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Magnetism and Matter Test 37

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Magnetism and Matter Test 37

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Question 1

$$1.6\times10 ^{19}$$

$$3.1\times10 ^{19}$$

$$4.8\times10 ^{19}$$

$$6.2\times10 ^{19}$$

Solution

Question 2

Ferrite substances

Ferromagnetic substances

Diamagnetic substances

Paramagnetic substances

Solution

Question 3

$$ x = \frac {1}{H} $$

$$ x = \frac {B}{H} $$

$$ x = \frac {M}{V} $$

$$ x = \frac {M}{H} $$

Solution

Question 4

Hysteresis

Susceptibility

Directional property

Attracting magnetic substances

Solution

Question 5

$$40^\circ$$

$$0^\circ$$

$$90^\circ$$

$$180^\circ$$

Solution

Question 6

$$ X \propto (T-T_c) $$

$$ X \propto \frac {1}{ T -T_c} $$

$$ X \propto \frac {1}{T} $$

$$ X \propto T $$

Solution

Question 7

This effect is common to all ferromagnetic substances

The hysteresis loop area is proportional to the thermal energy developed per unit volume of the material

The hysteresis loop area is independent of the thermal energy developed per unit volume of the material

The shape of the hysteresis loop is characteristic of the material

Solution

Question 8

Iron

Aluminium

Nickel

Hydrogen

Solution

Question 9

Paramagnetic materials

Diamagnetic materials

Ferromagnetic materials

Paramagnetic and ferromagnetic materials

Solution

Question 10

$$ 4 V $$

$$ 2 V $$

$$ \frac{V}{2} $$

$$ \frac{V}{4} $$

Solution

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