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Magnetic Fields due to Electric Current

Maharashtra Board · Class 12 · Physics

Quick revision notes for Magnetic Fields due to Electric Current — Maharashtra Board Class 12 Physics. Key concepts, formulas, and definitions for last-minute revision.

45 questions25 flashcards5 concepts

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Key Topics to Revise

1

Magnetic Force and Lorentz Force

  • Current-carrying wires in same direction attract each other, opposite directions repel
  • Magnetic force on a moving charge: F⃗ = q(v⃗ × B⃗)
  • Lorentz force combines electric and magnetic forces: F⃗ = q[E⃗ + (v⃗ × B⃗)]
2

Cyclotron Motion and Applications

  • Charged particles undergo circular motion in perpendicular magnetic fields
  • Radius of circular path: R = mv/(qB) = p/(qB)
  • Cyclotron frequency: f = qB/(2πm) - independent of velocity
3

Magnetic Force on Current-Carrying Conductors

  • Force on straight wire: F⃗ₘ = IL⃗ × B⃗
  • For arbitrary shaped wire: F⃗ₘ = I∮dl⃗ × B⃗
  • Net force on closed loop in uniform field is zero
4

Torque on Current Loop and Magnetic Dipole

  • Current loop in magnetic field experiences torque: τ⃗ = μ⃗ × B⃗
  • Magnetic dipole moment: μ⃗ = NIA⃗ (A⃗ perpendicular to loop plane)
  • Torque magnitude: τ = μB sin θ (θ between μ⃗ and B⃗)

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Full Notes

Key Concepts

The total force on a chargeA charged particle in a uniformThe magnetic field dB at pointFor any closed loopA straight conductor of length L

Frequently Asked Questions

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How to score full marks in Magnetic Fields due to Electric Current — Maharashtra Board Class 12 Physics?
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Sources & Official References

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

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