For paramagnetic materials magnetic susceptibility is related with temperature as:
Paramagnetic χ∝1/T Curie law, decreases with temperature increase.
Ref: NCERT Physics Class 12 Chapter 4 Moving Charges and Magnetism
Magnetic Effects and Electromagnetic Induction 1
This category gathers questions focused on magnetic effects and electromagnetic induction. It covers fundamental principles, such as magnetic fields, Faraday's law, Lenz's law, and related problem‑solving techniques.
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Curie – Weiss law is:
Curie-Weiss law: χ=C/(T-θ), susceptibility inversely proportional to T-θ.
Ref: NCERT Physics Class 12 Chapter 4 Moving Charges and Magnetism
When does a ferromagnetic material become a paramagnetic material?
Ferromagnetic becomes paramagnetic above Curie temperature, thermal disorder.
Ref: NCERT Physics Class 12 Chapter 4 Moving Charges and Magnetism
Which of the following will be suitable to demagnetize a magnet?
Demagnetize by heating above Curie temperature, hammering, or AC field decaying.
Ref: NCERT Physics Class 12 Chapter 4 Moving Charges and Magnetism
For ferromagnetic materials magnetic susceptibility (χ) is ________.
Ferromagnetic χ large positive ~10^3-10^5, strong attraction.
Ref: NCERT Physics Class 12 Chapter 4 Moving Charges and Magnetism
The magnetic field strength due to a short bar magnet at a distance r from the mid point of the magnet is B. Find the ma
Axial field Ba=μ0/4π 2M/r^3, equatorial Be=μ0/4π M/r^3, Ba=2Be.
Ref: NCERT Physics Class 12 Chapter 4 Moving Charges and Magnetism
An electron moving around the central nucleus has a magnetic moment equal to ___________, where 'l' is the magnitude of
Orbital magnetic moment μ= -eL/2m, L orbital angular momentum, Bohr magneton.
Ref: NCERT Physics Class 12 Chapter 4 Moving Charges and Magnetism
Magnetism at the centre of a bar magnet is ______.
Magnetism zero at centre of bar magnet, maximum at poles, neutral point.
Ref: NCERT Physics Class 12 Chapter 4 Moving Charges and Magnetism
A closely wound solenoid of 2000 turns and the area of cross-section 1.5 × 10 –4 m 2 carries a current of 2.0 A. It is s
Magnetic moment M=NIA=2000*1.5e-4*2=0.6 Am^2, torque τ=MB sinθ.
Ref: NCERT Physics Class 12 Chapter 4 Moving Charges and Magnetism
What is the angle of dip at magnetic poles of earth?
Angle of dip 90° at magnetic poles, 0° at magnetic equator.
Ref: NCERT Physics Class 12 Chapter 4 Moving Charges and Magnetism
When a bar magnet of magnetic moment \(\vec{M}\) is placed in a magnetic field \(\vec{B}\), then the torque exerted on t
Torque τ=M×B, magnitude MB sinθ, direction perpendicular to plane of M and B.
Ref: NCERT Physics Class 12 Chapter 4 Moving Charges and Magnetism
Which of the following statements is correct? 1. Magnetic line of forces always start from north pole and end at south p
Magnetic lines form closed loops, N to S outside, S to N inside, never end.
Ref: NCERT Physics Class 12 Chapter 4 Moving Charges and Magnetism
