Abstract
This paper describes a nearly zero-cost device, manufactured using DIY techniques, intended to reveal the weak magnetic force between two parallel current carrying wires. The device is easily portable to the classroom, requiring a unique auxiliary instrument: a DC power source capable of supplying a few amperes. By changing the electrical connections it is possible to switch quickly between the modes of parallel and antiparallel currents. The device has already been successfully used in the classroom, with first-year undergraduate and final-year secondary school students.
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