30 Questions
If the magnetic moment of a magnet is 8 × 10⁻⁷ Amp × m², what is its intensity of magnetization?
0.8 Amp/m
What is the maximum possible intensity of magnetization in a paramagnetic gas with a dipole moment of 1.5 × 10⁻²³ Amp × m² and a number density of 2 × 10²⁶ m⁻³?
3 × 10³ Amp/m
What is the unit of molar susceptibility?
m³
What is the ratio of the area of the B-H curve to the area of the I-H curve of a substance in the M.K.S system?
μ₀²
What is the amount of current required to demagnetize a small bar magnet with a coercivity of 4 × 10³ Amp/m, inserted inside a solenoid of 500 turns and length 1 m?
8 A
What is the SI unit of magnetic flux?
Weber
What is the magnetic induction or magnetic flux density equal to?
1 wb/m²
What is the characteristic of a medium that allows magnetic flux to pass through it?
Magnetic permeability
What is the magnetic flux density in terms of force experienced by a unit north pole?
B = F/m₀
What is the relation between Tesla and Gauss?
1 Tesla = 10⁴ Gauss
What is the relative permeability of soft iron?
1000
What is the unit of magnetic field intensity in CGS?
Oersted
What is the magnetic susceptibility of a substance?
The ratio of magnetization intensity to magnetic field intensity
What is the unit of magnetization intensity?
Ampere/meter
What is the magnetic moment of a substance?
The dipole moment per unit volume
What is the significance of the alignment of molecular magnets in a magnetized substance?
To increase the net magnetic moment
What is the shortest distance between the two poles of a bar magnet?
Effective length
What is the implication of breaking a magnet into several pieces?
Each piece becomes a magnet with a dipole
What is the significance of the repulsion between two magnets?
It is a sure test of magnetism
What is the direction of a freely suspended magnet in the Earth's magnetic field?
North-South direction
What is the property of a ferromagnetic material that allows it to retain some magnetism even after the external magnetic field is removed?
Retentivity
What is the term for the maximum value of magnetization that a ferromagnetic material can achieve?
Saturation value
What is the process of demagnetizing a material completely by applying a magnetizing field in a negative direction?
Corecivity
What is the lack of retracibility shown in the hysteresis loop curve?
Hysteresis
What is the value of the magnetizing field at which the magnetization becomes zero?
Coercivity
What is the direction of the magnetic moment vector?
From south to north
What is the unit of pole strength?
Ampere × meter
On what factors does the pole strength of a magnet depend?
On both the nature of the material and the area of cross-section
What is the magnetic moment of a magnet equal to?
The product of the strength of either pole and the effective length
What are the dimensions of the magnetic moment?
[AL²]
Test your understanding of magnetism and magnetic moments with this quiz. Calculate magnetic moments, intensity of magnetization, and more. Get ready to magnetize your knowledge!
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