Tathagata Haldar (anonymous) doubts edited answer

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.