Rub electrons from your hair with a comb and the comb becomes

Question

BlackTom AI · Accepted Answer

Consider what happens when two materials are rubbed together: electrons, which are negatively charged, can transfer from one material to the other depending on their tendency to hold or give up electrons. 
Option 1: 'positively charge.' This would mean the comb loses electrons to the hair, leaving the comb with fewer electrons. In the standard hair-comb experiment, electrons move from hair to the comb, not from the comb to the hair, so this option misstates the direction of electron transfer. 
Option 2: 'negatively charged.' This aligns with the observed outcome: the comb gains extra electrons from the hair, acquiring a negative charge, while the hair loses electrons and becomes positively charged. The phenomenon is a classic example of triboelectric charging due to friction. 
Option 3: 'discharged.' If the comb were discharged, it would be neutral. However, frictional contact typically induces a charge separation, leaving the comb with a net negative charge rather than neutral. 
In summary, rubbing hair with a comb transfers electrons from the hair to the comb, resulting in the comb becoming negatively charged, while the hair becomes positively charged.

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