Two very small plastic balls of equal mass are released from rest. One of them c

Question

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.)

The balls always have accelerations of equal magnitude. The speed of the balls keeps increasing. The acceleration of the 1-µC ball is 10 times that of the 10-µC ball. The acceleration of the 10-µC ball is 10 times that of the 1-µC ball. The acceleration of the balls keeps increasing.

Explanation / Answer

The balls always have accelerations of equal magnitude.

The speed of the balls keeps increasing.

The acceleration of the balls keeps increasing.

Force is equal and opposite ....which is same for both balls

now as both have same mass => acc of both will be same ... F = Kq1q2/r^2

as both will come closer the F will increase => a will increase also as F is increasing

=> speed will also increase of the balls

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