Magnetic Fields due to Electric Current — Class 12 Maharashtra HSC Physics revision notes
A 5-page visual revision sheet for Magnetic Fields due to Electric Current, 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.
What this Magnetic Fields due to Electric Current sheet covers
- Charge in motion
- Lorentz force
- Circular path
- magnetic force
- The Lorentz force
- on a charge q moving with velocity v
- magnitude
- with an electric field also present
- circular motion in a magnetic field
- Circular motion in a uniform field
- cyclotron formula
- The cyclotron formula
- momentum in terms of the radius
- SI unit of B
- older, still common unit
- cyclotron accelerator
- cyclotron
- The cyclotron accelerator
- cyclotron period
- cyclotron frequency
- Period and frequency of revolution
- from mv=qBR and T=2 pi R/v
- Limits and uses
- force on a current carrying conductor
- force on a wire
- Force on a current carrying wire
- straight wire of length vector L, uniform B
- magnitude when B is perpendicular to the wire
- wire of arbitrary shape, uniform B
- force between parallel wires
- force between two parallel currents
- force per unit length, wires a distance d apart
- Where the ampere comes from
- biot-savart law
- The Biot-Savart law
- field due to a current element I dl, at distance r
- vector form
- permeability of free space
- field due to a straight wire
- field of a long straight current
- Field of a long straight wire
- infinitely long wire, perpendicular distance R
- semi-infinite wire, from one end only
- field due to circular arc
- field at the centre of a coil
- Field of a circular arc and a full loop
- arc subtending angle theta at the centre, radius r
- full circular loop, centre, single turn
- coil of N turns
- magnetic dipole moment
- magnetic moment of a current loop
- ampere's circuital law
- ampere's law
- line integral of B around any closed loop equals mu_0 times the enclosed current
- solenoid magnetic field
- toroid magnetic field
- Solenoid and toroid
- long solenoid, n turns per unit length, current i
- toroid, N total turns, mean radius R
- Applying Ampere's law
- torque on a current loop
- flat coil of N turns, area A, in a uniform field B
- in terms of the magnetic moment
- moving coil galvanometer
- The moving coil galvanometer
- deflecting torque, radial field makes sin theta=1 always
- restoring torque of the spring, torsional constant K
- at equilibrium, deflection proportional to current
- 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 Fields due to Electric Current 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 Materials
- Mechanical Properties of Fluids
- Oscillations
- Rotational Dynamics
- Semiconductor Devices
- Structure of Atoms and Nuclei
- Superposition of Waves
- Thermodynamics
- Wave Optics