Demos by PIRA

  5H.40Force on current carrying wire in a magnetic field
  5H40.10Ampere's law: Currents in parallel wires attract or repel.
  5H40.30Force on a current carrying wire in a magnetic field.
  5H40.70Elementary motor: Magnet, wire and battery make a simple motor.
  5H40.71Ammeter shunt: Only a small current flows to the meter.
  5H40.71Elementary motor: Bar on rails over solenoid with core.