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 –

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

Also Read:

Chapter 5 Related Articles
Lorentz Force	Unit of Magnetic Field	The Bar Magnet
Electric Bell	Electromagnetic Induction	Earth's Magnetism
Magnetic Poles	Ferromagnetism	Magnetism and Gauss Law
Magnetization and Magnetic Intensity	Permanent Magnets and Electromagnets	Magnetic Properties of Materials

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CBSE CLASS XII Related Questions

1.
A light copper ring is freely suspended by a light string. A bar magnet is held horizontally with its length along the axis of the ring. The magnet is moved towards the ring with its N pole facing the loop. What will happen to the ring and its position? Explain.
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2.
Write any two features of nuclear forces.
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3.
A square loop of side 0.50 m is placed in a uniform magnetic field of 0.4 T perpendicular to the plane of the loop. The loop is rotated through an angle of 60° in 0.2 s. The value of emf induced in the loop will be:
- 5 V
- 3.5 V
- 2.5 V
- Zero V
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4.
Four independent waves are expressed as \[ (i)\; y_1=A_1\sin\omega t, \] \[ (ii)\; y_2=A_2\sin 2\omega t, \] \[ (iii)\; y_3=A_3\cos\omega t, \] \[ (iv)\; y_4=A_4\sin\left(\omega t+\frac{\pi}{3}\right) \] The interference between two of these waves is possible in
- (i) and (iii) only
- (iii) and (iv) only
- (i), (iii) and (iv) only
- All of them
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5.
Two parallel plate capacitors X and Y are connected in series to a 6 V battery. They have the same plate area and same plate separation but capacitor X has air between its plates, whereas capacitor Y contains a material of dielectric constant 4. Calculate the capacitances of X and Y, if the equivalent capacitance of the combination of X and Y is \( 4 \, \mu\text{F} \). Calculate the potential difference across the plates of X and Y.
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6.
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.
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