Two very small plastic balls of equal mass are released from rest.One of them carries +10 µC of excess charge and the other one carries +1µC of charge.No other charges or fields are present.Which of the following statements are true about them as they move away from each other? (There may be more than one correct choice. )
A)The acceleration of the 10-µC ball is 10 times that of the 1-µC ball.
B)The acceleration of the 1-µC ball is 10 times that of the 10-µC ball.
C)The balls always have accelerations of equal magnitude.
D)The speed of the balls keeps increasing.
E)The acceleration of the balls keeps increasing.

Question

Quizplus · Accepted Answer

The force between the balls is equal and opposite due to Newton's third law, so they have equal accelerations (C). As they repel each other, their speeds increase (D).

Two Very Small Plastic Balls of Equal Mass Are Released