1. Two point charges are separated by 6 cm. The attractive force between them is 20 N. (a) Find the magnitude of the electric force between the two charges when they are 12 cm apart. (b) If the charges
attracting each other have equal magnitudes, what is the magnitude of each charge? (c) How many
electrons are contained in the charge you found in part (b)?

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Tafari worked one summer on a ship that set weather buoys in the ocean. he watched how one of the buoys moved in the water. describe which parts of the wave would cause the buoy to bob up and down. which wave property determined how fast the buoys bobbed in the water? he observed that when the wind blew harder, the ocean waves were larger, and the buoys moved away from the ship. what effect, if any, did the waves have on how far the buoys moved? explain your answer.

Point charges q1 = 51 µc and q2 = −27 µc are placed 1.0 m apart, with q2 on the right. what is the force (in n) on a third charge q3 = 19 µc placed midway between q1 and q2? (assume the positive direction is to the right. indicate the direction with the sign of your answer.)