The electromagnetic force is ?
A. attractive.
B. repulsive.
C. both attractive and repulsive.
D. neither attractive nor repulsive

Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.