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12th Standard English Medium Physics Subject Magnetism and Magnetic Effects of Electric Current Book Back 2 Mark Questions with Solution Part - II

Published on: 01/06/2021

QB365 provides detailed and simple solution for every Book back Questions in class 12 Physics Subject. It will helps to get more idea about question pattern in every book back questions with solution.

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Std: 12th Standard - Physics

chapter: - Book back Questions

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Questions:

Generic 2

5 x 2 = 10

Compare dia, para and ferro-magnetism.

What is magnetic permeability?

What is magnetic susceptibility?

Define magnetic dipole moment.

What is meant by magnetic induction?

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Answers Key:

Generic 2

5 x 2 = 10

sno	Dia magnetic materials	Para magnetic materials	Ferromagnetic materials
(i)	In diamagnetic materials each electron orbit has finite orbital magnetic dipole moment.	In paramagnetic materials each atom (or) molecule has net magnetic dipole moment.	The ferromagnetic materials have net dipole moment as in a paramagnetic material.
(ii)	Since the orbital planes are oriented in random manner, the vector sum of magnetic moments is zero.	Due to the random orientation of these magnetic moments, the net magnetic moment of the material is zero.	Within each domain, the magnetic moments are spontaneously aligned in a direction.
(iii)	The resultant magnetic moment for each atom is zero.	There is net magnetic dipole moment induced in the direction of the applied field.	Since the direction of magnetisation varies from domain to domain, net magnetisation of the specimen is zero.

Magnetic permeability is the measure of ability of the material to allow the passage of magnetic field lines through it.

Magnetic susceptibility is defined as the ratio of the intensity of magnetisation (\(\vec { M } \)) induced in the material due to the magnetising field |\(\vec H\)|.
\( \chi _{ m }=\frac { |\vec { M } | }{ |\vec { H } | } \).

Magnetic dipote moment \(\vec { p }_{ m } \) is defined as the product of its pole strength and magnetic length. It is a vector quantity denoted by \(\vec { p }_{ m } \)
\(\vec { p }_{ m } ={ q }_{ m }\vec { d } \)

(i) When a substance is placed in a uniform magnetising field, the substance gets magnetised.
(ii) The total magnetic field inside the specimen is equal to the sum of the magnetic field produced in vacuum due to the magnetising field and the magnetic field due to the induced magnetism of the substance.