Magnetism

What is the S.I. unit of magnetic flux density?

Ampere per meter (A/m)
Tesla (T) (correct)
Newton per meter (N/m)
Weber (Wb)

What is the magnetic moment of a bar magnet, if its strength is m and its effective length is 2l?

m(l/2)
m(l/4)
m(2l) (correct)
m(l)

What is the relationship between magnetic flux density in a material and in vacuum?

B = B0/μ
B = μB0
B = μrB0 (correct)
B = B0/μr

What is the direction of the magnetic dipole moment vector?

From south to north pole (D) Signup and view all the answers

What is the unit of magnetic flux in the CGS system?

Maxwell (A) Signup and view all the answers

What is the unit of pole strength in the SI system?

Ampere × meter (A) Signup and view all the answers

What is the direction of pole strength with respect to the length of a magnet?

Perpendicular to the length (B) Signup and view all the answers

How does the pole strength of a magnet depend on the nature of the material?

It depends on the nature of the material and area of cross-section (D) Signup and view all the answers

What is the relationship between the magnetic moment and pole strength of a magnet?

Magnetic moment is equal to the product of pole strength and length (D) Signup and view all the answers

What happens to the moment of inertia of a bar magnet when it is cut into n parts?

It increases by a factor of n^2 (C) Signup and view all the answers

What is the relation between permeability and susceptibility in a material?

μ = μ_0 (1 + χ_m) (D) Signup and view all the answers

What is the unit of permeability in free space?

Henry per meter (D) Signup and view all the answers

What is the force between two magnetic poles of strength m1 and m2 lying at a distance r?

k × m1 × m2 / r^2 (B) Signup and view all the answers

What is the net magnetic flux through any closed surface?

Zero (B) Signup and view all the answers

What is the magnetic field due to an imaginary magnetic pole of strength m at a distance d?

μ_0 × m / (4π × d^2) (D) Signup and view all the answers

What is the reason for defining magnetic field as a set of lines or curves called magnetic lines of force?

To represent the space around a magnetic pole or magnet within which its effect can be experienced (A) Signup and view all the answers

What is the SI unit of magnetic moment or magnetic dipole moment?

Ampere meter squared (D) Signup and view all the answers

What is the magnetic moment of a bar magnet if its strength is m and its effective length is 2l?

m(2l) (B) Signup and view all the answers

What is the significance of the magnetic dipole moment vector?

It represents the strength of a magnet (A) Signup and view all the answers

What happens to the magnetic moment of a bar magnet when it is cut into n equal parts along the length?

It decreases by a factor of n (A) Signup and view all the answers

What is the magnetic induction or magnetic flux density (B) of a magnetised substance?

The number of magnetic lines of induction inside a magnetised substance crossing unit area normal to their direction (D) Signup and view all the answers

What is the intensity of magnetisation (I) of a substance?

The degree to which a substance is magnetised when placed in a magnetic field (D) Signup and view all the answers

What is the magnetic susceptibility (χm) of a substance?

The property of the substance which shows how easily it is magnetised (D) Signup and view all the answers

What is the unit of magnetic intensity (H) in CGS system?

Oersted (D) Signup and view all the answers

What is the relation between magnetic intensity (H) and magnetic induction (B) of a substance?

H is directly proportional to B (C) Signup and view all the answers

What is the direction of the pole strength with respect to the length of a magnet?

Perpendicular to the length (A) Signup and view all the answers

What is the dependence of pole strength of a magnet on the nature of the material?

It depends on the nature of the material and the area of cross-section (D) Signup and view all the answers

What is the effect on the moment of inertia of a bar magnet when it is cut into n parts?

It remains the same (C) Signup and view all the answers

What is the relationship between the magnetic moment and pole strength of a magnet?

The magnetic moment is directly proportional to the pole strength (C) Signup and view all the answers

What is the unit of pole strength in the SI system?

Ampere-meter (C) Signup and view all the answers

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Questions and Answers

What is the S.I. unit of magnetic flux density?

What is the magnetic moment of a bar magnet, if its strength is m and its effective length is 2l?

What is the relationship between magnetic flux density in a material and in vacuum?

What is the direction of the magnetic dipole moment vector?

What is the unit of magnetic flux in the CGS system?

What is the unit of pole strength in the SI system?

What is the direction of pole strength with respect to the length of a magnet?

How does the pole strength of a magnet depend on the nature of the material?

What is the relationship between the magnetic moment and pole strength of a magnet?

What happens to the moment of inertia of a bar magnet when it is cut into n parts?

What is the relation between permeability and susceptibility in a material?

What is the unit of permeability in free space?

What is the force between two magnetic poles of strength m1 and m2 lying at a distance r?

What is the net magnetic flux through any closed surface?

What is the magnetic field due to an imaginary magnetic pole of strength m at a distance d?

What is the reason for defining magnetic field as a set of lines or curves called magnetic lines of force?

What is the SI unit of magnetic moment or magnetic dipole moment?

What is the magnetic moment of a bar magnet if its strength is m and its effective length is 2l?

What is the significance of the magnetic dipole moment vector?

What happens to the magnetic moment of a bar magnet when it is cut into n equal parts along the length?

What is the magnetic induction or magnetic flux density (B) of a magnetised substance?

What is the intensity of magnetisation (I) of a substance?

What is the magnetic susceptibility (χm) of a substance?

What is the unit of magnetic intensity (H) in CGS system?

What is the relation between magnetic intensity (H) and magnetic induction (B) of a substance?

What is the direction of the pole strength with respect to the length of a magnet?

What is the dependence of pole strength of a magnet on the nature of the material?

What is the effect on the moment of inertia of a bar magnet when it is cut into n parts?

What is the relationship between the magnetic moment and pole strength of a magnet?

What is the unit of pole strength in the SI system?

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