Magnetic Forces and Magnetic Effects of Currents

These notes explain magnetic forces and how electric currents create magnetic fields. They’re designed for university physics students who need clear explanations.

What’s covered?

TopicKey Points
Force on a Moving ChargeHow moving charges create magnetic fields and experience forces in them, including conditions for zero and maximum force.
Lorentz Force EquationThe fundamental equation combining electric and magnetic forces on charged particles, with definitions of all variables.

Features

  • Easy to understand explanations with clear examples.
  • Complete syllabus coverage for university physics courses.
  • Free to download in pdf format for offline study.
  • Includes questions and answers at the end of each topic for practice.

FAQs

What is the magnetic force on a stationary charge? Zero. A charge must be moving to experience a magnetic force.

When is the magnetic force maximum on a moving charge? When the charge moves perpendicular to the magnetic field direction.

Can magnetic force change a particle’s speed? No. Magnetic force only changes direction, not speed or kinetic energy.

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  • Reviewed By Manisha Joshi, M.Sc, Physics
  • Last Updated April 20, 2026
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