Question

Why do pieces of paper and plastic pen attract

Answer 1

when we rubbed the plastic comb on our dry hair , it gained an electric charge as the result
the charge build in the plastic comb , making it electrically charged and enabling it to attract the piece of paper . however metal is a good conductor of electricity it does not let the charges build in it .

hope it's helpful for you

Answer 2

plastic isnt a good conductor of electricity