3. a) Charge C will move directly to the right. The symmetry of the charges A and B ensures that charge C experiences no net force in the y-direction [the y-contributions to the force from charge A cancels out the contribution from charge B.] b) Charge C will accelerate to the right and keep speeding up. The acceleration will drop to zero the farther away the charge gets, however, just like in problem 1. c) r F = 8 125 kQ 2 d 2 ˆ x d) The charge will initially accelerate to the left. After it has passed the origin, it will slow down [i.e., the acceleration will go from leftward to zero to rightward and back again. The charge will be moving fastest as it passes through the origin. r F = " 16 125 kQ 2 d 2 ˆ x 4. a) ii. The friction transferred electrons from your shirt to the balloon, making the shirt positive and the balloon negative. b) i. Neutrons have zero charge and so the balloon will feel no force. ii. Protons are positively charged and so the balloon and the proton will be attracted
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