what happens when we rub comb with dry hair
sir, in your video lecture you have said that when we rub our dry hair with a comb that time some electrons move from hair to comb but after rubbing the dry hair with comb if we leave the comb freely without getting contact with paper after sometimes if we try to attract paper with the comb it does not work or after rubbing the comb it attracts the hair for a short period of time only why not for long period of time. Explain.
Charged objects have an electric field in their surrounding. The air always have small number of ionized particles – which might come from cosmic radiation, local electrical activity, etc. Now if your comb is negatively charged, positively charged ions will be attracted to it and negative ones will be repelled. Over time, this results in a neutralization of the charge on the comb.