Forces Act at Distance Practice Test

A student repeats a magnet-and-paper-clip test with different gaps. At 1 cm, many clips jump up. At 5 cm, fewer clips jump. At 15 cm, none jump. What is the best conclusion?

A balloon is rubbed on a sweater and then held about 2 cm above tiny pieces of paper. The balloon does not touch the paper, but the paper pieces jump up toward the balloon. Which type of force is acting at a distance in this investigation?