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Electromagnetic Induction

Maharashtra Board · Class 12 · Physics

Quick revision notes for Electromagnetic Induction — Maharashtra Board Class 12 Physics. Key concepts, formulas, and definitions for last-minute revision.

45 questions23 flashcards5 concepts

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Key Topics to Revise

1

Faraday's Laws and Basic Concepts

  • First Law: Whenever magnetic flux through a closed circuit changes, an EMF is induced
  • Second Law: Induced EMF is proportional to rate of change of magnetic flux
  • Magnetic flux φ = B·A = BA cos θ, measured in Weber (Wb)
2

Lenz's Law and Direction of Induced Current

  • Lenz's Law: Direction of induced current opposes the change causing it
  • Induced current creates magnetic field opposing flux change
  • If flux increases, induced current opposes increase; if flux decreases, induced current opposes decrease
3

Motional EMF

  • EMF induced when conductor moves through magnetic field
  • Two cases: (1) Straight conductor moving perpendicular to field (2) Rotating conductor
  • Lorentz force on charges in moving conductor causes charge separation
4

Self-Inductance

  • Self-inductance: Property of coil to oppose changes in its own current
  • Symbol: L, Unit: Henry (H), where 1 H = 1 Wb/A = 1 V·s/A
  • Depends only on geometry and material properties of coil

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Full Notes

Key Concepts

First Law (Qualitative)The direction of induced currentEMF induced in a conductor movingThe property of a circuitThe ability of one circuit

Frequently Asked Questions

What are the important topics in Electromagnetic Induction for Maharashtra Board Class 12 Physics?
Electromagnetic Induction covers several key topics that are frequently asked in Maharashtra Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Electromagnetic Induction — Maharashtra Board Class 12 Physics?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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