Magnetic Materials — Class 12 Maharashtra HSC Physics revision notes
A 5-page visual revision sheet for Magnetic Materials, written for Class 12 Maharashtra HSC Physics. Formulas, diagrams and the traps that cost marks, laid out to be read the night before rather than the term before. Free, and it opens inside CapCompass.
Page 1 as PDF
Magnetic Materials in one look
a bar magnet in a field, then why iron, nickel and cobalt behave so differently from everything else
Torque on a magnetic dipole in a uniform field
- torque, theta between m and B
τ=mtimesB - magnitude
τ=mBsinθ
Potential energy of a magnetic dipole
- general angle theta
U_m=-mBcosθ
Special angles of a magnetic dipole
- θ=0, m parallel to B — minimum, most stable orientation
- θ=90°, m perpendicular to B — zero potential energy
- θ=180°, m antiparallel to B — maximum, most unstable orientation
Small oscillations of a suspended magnet
- small-angle restoring torque τ=-mBsinθ≈-mBθ matches angular SHM
- this gives Id^2θ/dt^2=-mBθ, with ω^2=mB/I
- a vibration magnetometer uses this swing to compare moments or find Earth's horizontal field
Time period of oscillation
- angular frequency
ω=√mB/I - time period
T=2π√I/mB
Page 1 of 5. The full sheet, all 5 pages, opens free in the app.
What this Magnetic Materials sheet covers
- torque on a magnetic dipole
- Torque on a magnetic dipole in a uniform field
- torque, theta between m and B
- magnitude
- potential energy of a dipole in a magnetic field
- Potential energy of a magnetic dipole
- general angle theta
- Special angles of a magnetic dipole
- oscillations of a bar magnet
- vibration magnetometer
- Small oscillations of a suspended magnet
- time period of a bar magnet
- Time period of oscillation
- angular frequency
- time period
- origin of magnetism
- Where magnetism in materials comes from
- Poles of a current loop
- magnetization
- magnetic moment per unit volume
- field inside, from the winding and the material
- magnetic susceptibility
- relative permeability
- Magnetic intensity, susceptibility and permeability
- magnetic intensity
- susceptibility, when M is proportional to H
- permeability, and B in terms of H
- Dia, para and ferro in one look
- Diamagnetic
- Paramagnetic
- Ferromagnetic
- diamagnetism
- diamagnetic materials
- paramagnetism
- paramagnetic materials
- curie's law
- magnetization of a paramagnetic material
- susceptibility
- Diamagnetic vs paramagnetic
- ferromagnetism
- domain theory
- Ferromagnetism and the domain theory
- curie temperature
- Curie-Weiss law, above the Curie temperature T_C
- hysteresis
- hysteresis loop
- Soft vs hard ferromagnetic material
- Soft (soft iron)
- Hard (steel, alnico)
- permanent magnet
- electromagnet
- Permanent magnets and electromagnets
- magnetic shielding
- Symbols
- Traps that cost marks
- Tricks that save time
How CapCompass uses this sheet
These notes are not a standalone PDF. CapCompass plans Physics chapter by chapter against your real exam dates and free hours, and when the plan reaches Magnetic Materials the sheet opens inside the study block itself — at the page covering the sub-topic that block is on, with the timer still running. Revision arrives at the moment the plan says revise, instead of having to be gone looking for.
More Physics Class 12 revision notes
- AC Circuits
- Current Electricity
- Dual Nature of Radiation and Matter
- Electromagnetic Induction
- Electrostatics
- Kinetic Theory of Gases and Radiation
- Magnetic Fields due to Electric Current
- Mechanical Properties of Fluids
- Oscillations
- Rotational Dynamics
- Semiconductor Devices
- Structure of Atoms and Nuclei
- Superposition of Waves
- Thermodynamics
- Wave Optics