Question

After being rubbed on dry hair, a plastic comb picks up tiny bits of paper. The force involved is:

At a school science fair, Kabir shows two experiments. In the first, he brings a bar magnet near a few steel pins lying on a table; the pins jump up and stick to the magnet before touching it. In the second, he rubs an inflated balloon on his woollen sweater and holds it near a thin stream of water from a tap; the stream bends towards the balloon.