Electromagnetic Induction and Alternating Current

IIT-JEE · Class 12 · Physics

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What’s covered

topics
- Magnetic Flux
  - flux linkage
  - work done in changing the orientation of a current-carrying coil in a magnetic field
- Faraday's Law
  - law of electromagnetic induction
  - direction of induced EMF
  - induced charge
- Lenz's Law
  - direction of induced current
  - conservation of energy
- Motional EMF
  - finding the direction of induced EMF
  - special cases
  - motional EMF as an equivalent battery
  - motional EMF in a random-shaped wire
  - EMF across a rotating straight conductor
  - motional EMF in a non-uniform magnetic field
- Induced Electric Field
  - induced EMF in a stationary conductor
  - non-conservative nature of the induced field
- Self-Inductance
  - direction of the self-induced EMF
  - inductance of a solenoid
- Mutual Inductance
  - total flux linked to a pair of coils
  - calculation of mutual inductance from self-inductances
- Combination of Inductors
  - series and parallel combinations
- Inductor in Circuits
  - analogy between self-induction and inertia
- Growth and Decay of Current
  - growth and decay of current in an LR circuit
- Energy in an Inductor
  - energy stored in the magnetic field of an inductor
- LC Oscillations
  - oscillations in an LC circuit
  - oscillation of electrical and magnetic energy
- AC Fundamentals
  - mean or average value of current
  - root mean square (RMS) value of current
- Phasor Diagrams
  - phasor representation of AC quantities
- AC Circuits
  - circuit containing resistor only
  - inductor only with inductive reactance
  - capacitor only with capacitive reactance
- Series LCR Circuit
  - AC circuit containing R L and C in series
  - impedance and phase
- Power in AC Circuits
  - power in a series LCR circuit
  - wattless component of current
  - choke coil
- Resonance
  - resonance in a series LCR circuit
  - Q-factor (quality factor) of resonance
- Transformers
  - principle and working
- Skin Effect
  - concept and significance