Electromagnetic induction and alternating currents Topics - IIT JEE Syllabus

1

Electromagnetic induction

2m1/10

📌 Key FormulaEMF induced when magnetic flux changes.

2

Faraday's law

2m2/10

📌 Key Formulaε = -dφ_B/dt

3

Induced emf and current

2m2/10

📌 Key Formulaε = -N dφ/dt, I = ε/R

4

Lenz’s Law

2m2/10

📌 Key FormulaInduced current opposes the change in flux.

5

Eddy currents

2m1/10

📌 Key FormulaInduced currents in bulk conductors, applications (braking, damping).

6

Self and mutual inductance

2m3/10

📌 Key FormulaSelf inductance L = Nφ/I, ε = -L dI/dt. Mutual inductance M, ε₂ = -M dI₁/dt.

7

Basics of Alternating currents

2m1/10

📌 Key FormulaI = I₀ sin ωt, V = V₀ sin ωt

8

Peak and RMS value of alternating current/ voltage

2m2/10

📌 Key FormulaI_rms = I₀/√2, V_rms = V₀/√2

9

Reactance and impedance

2m3/10

📌 Key FormulaInductive reactance X_L = ωL, Capacitive reactance X_C = 1/(ωC), Impedance Z = √(R² + (X_L - X_C)²)

10

LCR series circuit

2m3/10

📌 Key FormulaV = I Z, phase φ = tan⁻¹((X_L - X_C)/R)

11

Quality factor

2m3/10

📌 Key FormulaQ = ω₀L/R = 1/(ω₀CR), sharpness of resonance.

12

Power in AC circuits

2m2/10

📌 Key FormulaP = V_rms I_rms cos φ

13

Wattless current

2m2/10

📌 Key FormulaCurrent when average power is zero (φ = 90°)

14

AC generator and transformer

2m3/10

📌 Key FormulaGenerator: ε = NBAω sin ωt. Transformer: V_s/V_p = N_s/N_p, I_s/I_p = N_p/N_s (ideal), P_in = P_out.