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Demonstrate a closed circuit with the help of the ball, which lights and sounds when the circuit is closed.
Have two people each touch one of the metal strips of the ball and while holding hands. The ball will flash and sound as long as the circuit is closed. Test what happens when the two people let go of each other's hands. Does the experiment work with 3, 4, 5 or more people?
Dimensions: The ball's diameter is approx. 4 cm.
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