''Charging by contact is not a reliable method because it often gives the charge opposite to that expected (in an electroscope)''. How?

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Solution

Charging by conduction is when two charge objects interact to a neutral object. Charging by conduction are also called ‘charging by contact’. By charging conduction, a charged object should have touched the charged electroscope and transfer it charges to it. An example is when you walk in the door and you rub your feet, well that’s charging by rubbing. And then when u touch the doorknob those charges on your hand are leaving you and they're going into the doorknob. And that’s called charging by contact.

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