When currents in wires run parallel, the wires attract due to the magnetic fields from the currents and the Lorentz force. The currents can also be run anti-parallel, making the wires repel. Place the ...

A drinking cup, a small coil, and a magnet are turned into a loudspeaker. A cup with a hole and a second coil are provided to allow demonstrating the construction of the speaker. Please handle the ...