EMI mein Faraday laws, Lenz law, eddy currents aur inductance aate hain — AC ka base chapter. Yahan aapko is chapter ke sabse important formulas aur quick revision points free milte hain — NCERT/CBSE syllabus ke hisaab se, boards aur JEE/NEET dono ke liye.
Important Formulas & Concepts — Electromagnetic Induction
- Flux: φ = BA·cosθ
- Faraday: e = −dφ/dt; N turns: e = −N·dφ/dt
- Motional EMF: e = BLv
- Self inductance: e = −L·dI/dt; solenoid L = μ₀n²Al
- Mutual inductance: e₂ = −M·dI₁/dt
- Energy in inductor: U = ½LI²
- Rotating coil: e = NBAω·sin(ωt)
- Rod rotating in B: e = ½BωL²
Quick Revision Points
- Lenz law energy conservation ka consequence hai
- Induced current change ka oppose karti hai — direction isi se nikalo
- Eddy currents: brakes, induction furnace, speedometer
- Transformer mutual induction par kaam karta hai
- Motional EMF ke questions mein force aur power bhi puchte hain
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FAQ
Lenz law se direction kaise nikalu?
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