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We can demonstrate the force that exists between electric charges by suspending a positively charged glass rod.
If a second - positively charged - glass rod is held close to the suspended glass rod, the suspended rod will twist away from the other rod, as shown.
This shows that "like charges repel".
If a second - negatively charged - ebonite rod is held close to the suspended glass rod, the suspended rod will twist towards the other rod, as shown.
This shows that "unlike charges attract".
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