Out of two, which one would make a higher pitch and why?
1) A post card , rubbed slowly against a comb?
2) A sandpaper , rubbed rapidly against a comb?
A plastic comb is rubbed against dry hair gently. What is the effect on both the plastic comb and dry hair?
Why does a plastic comb rubbed with dry hair attract bits of paper?
Why does a plastic comb rubbed with dry hair attract tiny pieces of paper?