Moving Charges and Magnetism
A compass needle swings when a wire beside it carries a current. Moving charges make magnetic fields, and magnetic fields push on moving charges: the idea behind every motor and every particle accelerator. In this chapter you learn the force on a charge and on a current, the field of a wire, a loop and a solenoid, the torque on a coil, and the magnetism of materials. Python traces the spiral path of a charge in a field.
Part of Physics · High School (11–12) (chapter 18)
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Magnetic Force on Charges and Currents
The force a magnetic field puts on moving charges and on wires. The Lorentz force, circular and helical paths, motion in combined electric and magnetic fields, the cyclotron, and the force on a current-carrying wire.
Biot-Savart and Ampere's Circuital Law
How currents make fields. The Biot-Savart law, the field of a long wire, a circular loop and its axis, Ampere's circuital law, solenoids and toroids, and the force between two parallel currents.