Electromagnetic Induction notes
OpenThe 4 formulas you need for Electromagnetic Induction, on one page.
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Electromagnetic Induction: One-Page Formula Sheet
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Last updated: 26 October 2026
Formula sheet
Electromagnetic Induction formulas
Electromagnetic Induction — formula sheet
Formulas
- ε = −dΦ/dt
- Motional EMF ε = Bvl
- Solenoid: L = μ₀n²Al; energy U = ½LI²
- LR growth: I = I₀(1 − e^(−t/τ)), τ = L/R
Key ideas
- Changing magnetic flux induces an EMF
- Lenz's law: the induced current opposes the change
- A rod moving in a field acts like a battery of EMF Bvl
- An inductor resists changes in current
Traps to avoid
- Missing the minus sign meaning of Lenz's law
- Forgetting that flux depends on area, field and angle
- Using growth instead of decay formulas
jeevisionary.in/jee-topics/physics/emi/
FAQs
Frequently asked questions
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Read it once a day for a week, then cover it and write the formulas from memory. Revise only the ones you missed.