Electromagnetic Induction
ICSE · Class 12 · Physics
All formulas from Electromagnetic Induction in ICSE Class 12 Physics. Key equations, constants, and identities for board exam preparation.
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Formulas
1. Magnetic Flux
Φ = B·A = BA cosθ
Φ = NBA
2. Faraday’s Laws and Induced Emf
e = -dΦB/dt
e = -N dΦB/dt = -d(NΦB)/dt
I = e/R
q = IΔt = (N/R)ΔΦB
e ∝ 1/Δt, I ∝ 1/Δt
3. Lenz’s Law and Direction of Current
Direction of induced emf/current opposes the cause producing it
4. Methods of Changing Magnetic Flux
Φ = BA cosθ
e = BAω sinθ
e = -A cosθ (dB/dt)
∮E·dl = -dΦB/dt
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