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Swinging metals

This effect can be demonstrated in the classroom using the equipment shown below and a horseshoe magnet. A sheet of non-ferrous metal (eg copper or aluminium) is attached to an arm of wood and swung between the poles of a horseshoe magnet.

In the examples following, we have a variety of metal sheets with open and closed slots and no slots.

There is a flat wooden rod about thirty centimetres long with a thin flat rectangular piece of aluminium sheet attached to its left end. There are a series of five open slots cut parallel to the wooden rod. The slots extend all the way to the edge of the metal.

This pendulum has an aluminium sheet with open slots.

There is a flat wooden rod about thirty centimetres long with a thin flat rectangular piece of aluminium sheet attached to its left end. There are a series of five closed slots cut parallel to the wooden rod.

This pendulum has an aluminium sheet with closed slots.

There is a flat wooden rod about thirty centimetres long a with a thin flat semicircular piece of copper sheet attached to its left end

A solid copper sheet with no slots.