Courses

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.

StemPy Lab

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.

StemPy Lab

A current loop as a tiny magnet, and real magnets. Torque on a loop and magnetic moment, the moving-coil galvanometer and its conversion to an ammeter and a voltmeter, bar magnets, the Earth's field, and para-, dia- and ferromagnetism.

StemPy Lab

A compass needle always points north, but near a wire with a current it swings away. In this course we map the field of a magnet with field lines, we find that a current has a magnetic field too, and we use a coil to make an electromagnet that we can switch on and off.

StemPy Lab

A fan, a washing machine and a toy car all have a motor. In this course we find that a magnetic field pushes on a wire that carries a current, we find the direction of the push with Fleming's left-hand rule, and we see how this push turns the coil of an electric motor.

StemPy Lab