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Sometimes you can become part of the circuit without even realising. Have you ever been zapped by a static shock?
When charged objects are placed near to each other or touching they will behave a little like magnets. Two similarly charged objects repel, two differently charged objects attract.
This happens because around a charged object, the electric field affects other charged objects, causing them to be attracted or repelled. The field strength decreases with distance.
Here are a couple of simulators so you can see how charges can build up and what happens when they discharge. Have fun.
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