what is the nature of the unknown charge if it is attracted by a charged up ebonite rod and repelled by a charged up glass rod?
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ELECTROMAGNET force,,,,,,,,,,,,,,,,,,
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The phenomena of charging due to rubbing are called Triboelectric effect.
When an ebonite rod is rubbed with fur the rod gets negatively charged because the friction between the fur and the rod makes the ebonite rod to gain an electron from the fur. This is because electrons in fur are less tightly bound than the electrons in the ebonite rod.
When you are rubbing the glass rod with the silk cloth, electrons are stripped away from the atoms in the glass and transferred to the silk cloth. This leaves the glass rod with more positive than negative charge, so you get a net positive charge.
Hence, ebonite rod and glass rod will attract each other.
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