# Ncert 12th Physics Chapter-5

## Permanent Magnets

Chapter-5|Magnetism and Matter| NCERT 12th Physics: Permanent Magnets: The substances which at room temperature retain their ferromagnetic property for a long period of time are called permanent magnets. Permanent magnet can be made by placing a rod of ferromagnetic material in a current carrying solenoid. The magnetic field of the solenoid magnetises the rod. The […]

## Magnetic Properties of Materials

Chapter-5|Magnetism and Matter| NCERT 12th Physics: Magnetic Properties of Materials: Materials can be classified as diamagnetic, paramagnetic and ferromagnetic on the basis of susceptibility. Diamagnetism: Diamagnetic substances are those substances which have a tendency to move from stronger to the weaker part of the external magnetic field. When a bar of diamagnetic material is placed

## Magnetic Field Strength at a Point Due to a Bar Magnet

Chapter-5|Magnetism and Matter| NCERT 12th Physics: Magnetic Field Strength at a Point Due to a Bar Magnet: The Strength of magnetic field at any point is defined as, the force experienced by a hypothetical unit north pole placed at that point. It is a vector quantity. The direction of magnetic field B is the direction

## Hysteresis Curve

Hysteresis Curve: NCERT Class 12th Physics || Chapter-5 || Magnetism and Matter: The hysteresis Curve represent the relation between the magnetic induction B or intensity of magnetisation I of a ferromagnetic material with magnetic intensity H. The graph shows the behaviour of the material as we take it through one cycle of magnetisation. Formation of

## Relation Between Relative Magnetic Permeability and Magnetic Susceptibility

Relation Between Relative Magnetic Permeability and Magnetic Susceptibility:

## Various Terms Related to Magnetism

Various Terms Related to Magnetism: Magnetic Intensity(H):- The capacity of magnetic field to magnetize the substance is measured in terms of magnetic intensity of the field.   Intensity of Magnetisation(I):- The intensity of magnetization of a magnetized substance represent the degree to which the substances magnetized.   Magnetic Induction(B):- It is defined as the number of

## Characteristics of the Earth’s Magnetic Field

Characteristics of the Earth’s Magnetic Field: The magnetic field lines of the earth resemble that of a hypothetical magnetic dipole located at the centre of the earth. The axis of dipole is presently tilted by approximately 11.3 degree with respect to the axis of the rotation of the earth. The pole near the geographic North

## The Earth’s Magnetism

The Earth’s Magnetism: In 1600, Sir William Gilbert was the first to suggest that the Earth itself is a huge magnet. Earth behave as if a powerful magnet is placed within it. But this assumptions fails because temperature inside the earth is very high (more than Curie temperature). If there is any bar magnet inside

## Magnetism and Gauss’ law

Magnetism and Gauss’ law: The net magnetic flux (∅B) through any closed surface is always zero.   This law states that the number of magnetic field lines living any closed surface is always equal to the number of magnetic field lines entering it. Let a closed surface S is held in a uniform magnetic field

## The Electrostatic Analog

The Electrostatic Analog: The magnetic dipole moment of a bar magnet- M= m(2l), where,  m = strength of the pole and 2l = length of dipole. The magnetic dipole is analogous to an electric dipole consisting of two equal charges of opposite sign(+- q) separated by 2a. Electric dipole moment P=q(2a) The equation for magnetic

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