NCERT Solutions For Class 12 Physics Chapter 5: Magnetism and Matter

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NCERT Solutions for class 12 physics chapter 5 Magnetism and Matter are given in this article with a detailed explanation. Magnetism is a force by virtue of which a metal is attracted to certain materials, which are known as magnets. These days magnets have a lot of applications in areas such as an electric bell, telephone, radio, loudspeaker, motors, fans, screwdrivers, etc.

The chapter has a weightage of 5 to 6 marks in the CBSE Class 12 Physics Examination. The NCERT Solutions for Class 12 Physics Chapter 5 covers concepts of the dipole moment of a magnet, permanent magnets, classification of magnetic materials, etc.

Download PDF: NCERT Solutions for Class 12 Physics Chapter 5

NCERT Solutions for Class 12 Physics Chapter 5

NCERT solutions for class 12 physics chapter 5: Magnetism and Matter are given below.

Class 12 Physics Chapter 5 Magnetism and Matter – Important Concepts

Magnetic field lines are the imaginary lines along which the North Magnetic move.

The larger the number of magnetic field lines per unit area, the stronger the magnetic field will be.

When a magnet placed in a uniform magnetic field B experiences a dipole moment m, then it experiences a force, torque, and potential energy.

Force = zero
Torque = m*B
Potential energy = m*B.

Magnetic Materials are classified as Diamagnetic, paramagnetic, and ferromagnetic. χ refers to the magnetic sensitivity of the material.

Diamagnetic materials – negative and small χ
Paramagnetic materials – positive and small χ
Ferromagnetic materials – large χ.

The magnetic field of a solenoid with a radius, carrying I current at distance r on the axis is given by:

\(B = {\mu_0 \over 4\pi} {2m \over r^3}\)

In the above formula, m refers to the magnetic moment of the solenoid that is given by –

\(m = n(2l)(\pi a^2)\)

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CBSE CLASS XII Related Questions

1.
Write the expression for the magnetic field due to a current element in vector form. Consider a 1 cm segment of a wire, centered at the origin, carrying a current of 10 A in positive x-direction. Calculate the magnetic field \( \mathbf{B} \) at a point \( (1 \, \text{m}, 1 \, \text{m}, 0) \).
View Solution
2.
Write any two features of nuclear forces.
View Solution
3.
Draw the number of scattered particles versus the scattering angle graph for scattering of alpha particles by a thin foil. Write two important conclusions that can be drawn from this plot.
View Solution
4.
Photoemission of electrons occurs from a metal (\( \phi_0 = 1.96 \, \text{eV} \)) when light of frequency \( 6.4 \times 10^{14} \, \text{Hz} \) is incident on it. Calculate: Energy of a photon in the incident light, The maximum kinetic energy of the emitted electrons, and The stopping potential.
View Solution
5.
Assertion (A) : All atoms have a net magnetic moment. Reason (R) : A current loop does not always behave as a magnetic dipole.
- Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
- Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
- Assertion (A) is true, but Reason (R) is false.
- Both Assertion (A) and Reason (R) are false.
View Solution
6.
If Bohr’s quantization postulate (angular momentum \( = \frac{nh}{2\pi} \)) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.
View Solution

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NCERT Solutions For Class 12 Physics Chapter 5: Magnetism and Matter

NCERT Solutions for Class 12 Physics Chapter 5

Class 12 Physics Chapter 5 Magnetism and Matter – Important Concepts

CBSE CLASS XII Related Questions

1.
Write the expression for the magnetic field due to a current element in vector form. Consider a 1 cm segment of a wire, centered at the origin, carrying a current of 10 A in positive x-direction. Calculate the magnetic field \( \mathbf{B} \) at a point \( (1 \, \text{m}, 1 \, \text{m}, 0) \).

2.
Write any two features of nuclear forces.

3.
Draw the number of scattered particles versus the scattering angle graph for scattering of alpha particles by a thin foil. Write two important conclusions that can be drawn from this plot.

4.
Photoemission of electrons occurs from a metal (\( \phi_0 = 1.96 \, \text{eV} \)) when light of frequency \( 6.4 \times 10^{14} \, \text{Hz} \) is incident on it. Calculate: Energy of a photon in the incident light, The maximum kinetic energy of the emitted electrons, and The stopping potential.

5.
Assertion (A) : All atoms have a net magnetic moment. Reason (R) : A current loop does not always behave as a magnetic dipole.

6.
If Bohr’s quantization postulate (angular momentum \( = \frac{nh}{2\pi} \)) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.

Similar Physics Concepts

Comments

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NCERT Solutions For Class 12 Physics Chapter 5: Magnetism and Matter

NCERT Solutions for Class 12 Physics Chapter 5

Class 12 Physics Chapter 5 Magnetism and Matter – Important Concepts

CBSE CLASS XII Related Questions

1.Write the expression for the magnetic field due to a current element in vector form. Consider a 1 cm segment of a wire, centered at the origin, carrying a current of 10 A in positive x-direction. Calculate the magnetic field \( \mathbf{B} \) at a point \( (1 \, \text{m}, 1 \, \text{m}, 0) \).

2. Write any two features of nuclear forces.

3. Draw the number of scattered particles versus the scattering angle graph for scattering of alpha particles by a thin foil. Write two important conclusions that can be drawn from this plot.

4.Photoemission of electrons occurs from a metal (\( \phi_0 = 1.96 \, \text{eV} \)) when light of frequency \( 6.4 \times 10^{14} \, \text{Hz} \) is incident on it. Calculate: Energy of a photon in the incident light, The maximum kinetic energy of the emitted electrons, and The stopping potential.

5.Assertion (A) : All atoms have a net magnetic moment. Reason (R) : A current loop does not always behave as a magnetic dipole.

6. If Bohr’s quantization postulate (angular momentum \( = \frac{nh}{2\pi} \)) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
Write the expression for the magnetic field due to a current element in vector form. Consider a 1 cm segment of a wire, centered at the origin, carrying a current of 10 A in positive x-direction. Calculate the magnetic field \( \mathbf{B} \) at a point \( (1 \, \text{m}, 1 \, \text{m}, 0) \).

2.
Write any two features of nuclear forces.

3.
Draw the number of scattered particles versus the scattering angle graph for scattering of alpha particles by a thin foil. Write two important conclusions that can be drawn from this plot.

4.
Photoemission of electrons occurs from a metal (\( \phi_0 = 1.96 \, \text{eV} \)) when light of frequency \( 6.4 \times 10^{14} \, \text{Hz} \) is incident on it. Calculate: Energy of a photon in the incident light, The maximum kinetic energy of the emitted electrons, and The stopping potential.

5.
Assertion (A) : All atoms have a net magnetic moment. Reason (R) : A current loop does not always behave as a magnetic dipole.

6.
If Bohr’s quantization postulate (angular momentum \( = \frac{nh}{2\pi} \)) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.