Moving Charges and Magnetism
Madhya Pradesh Board · Class 12 · Physics
Quick revision notes for Moving Charges and Magnetism — Madhya Pradesh Board Class 12 Physics. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Magnetic Force and Lorentz Force
- Magnetic force acts only on moving charges, not on stationary charges
- Magnetic force is always perpendicular to both velocity and magnetic field
- Magnetic force does no work as it's perpendicular to motion
Motion of Charged Particles in Magnetic Field
- Circular motion when v ⊥ B with constant speed
- Helical motion when v has components both ∥ and ⊥ to B
- Radius of circular path is directly proportional to momentum
Magnetic Force on Current-Carrying Conductors
- Force on current-carrying wire is sum of forces on individual moving charges
- Force is perpendicular to both current direction and magnetic field
- No force when current is parallel to magnetic field
Biot-Savart Law
- Gives magnetic field due to a current element
- Field is proportional to current and inversely proportional to r²
- Field direction is perpendicular to both current element and position vector
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Moving Charges and Magnetism covers several key topics that are frequently asked in Madhya Pradesh Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
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