• I always confuse which is which here, so apologies on incompleteness. The basic principle involves the transfer of electrons to create charged objects. Rubbing one object with one material transfers electrons from the material to the object. This results in a negatively charged object and a positively charged material. The other instance results in the opposite situation. Why this happens involves inherent properties of the material and object. Some atoms are inclined to accept electrons, and others tend to lose electrons easily. This property is known as electronegativity. A material with a high tendency to lose electrons rubbed on an object which accepts electrons easily will result in a positively charged material and negatively charged object. Of course what we are usually interested in as far as what is gaining a charge, is the object.

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