A proton and an electron are released from rest, with only the electrostatic force acting. Which of the following statements must be true about them as they move toward each other? (There could be more than one correct choice.)
A) Their acceleration keeps decreasing.
B) Their kinetic energy keeps increasing.
C) Their electric potential energy keeps decreasing.
D) Their kinetic energy keeps decreasing.
E) Their electric potential energy keeps increasing.
Question 2
Two long parallel wires that are 0.30 m apart carry currents of 5.0 A and 8.0 A in the opposite direction. Find the magnitude of the force per unit length that each wire exerts on the other wire and indicate if the force is attractive or repulsive.
(0 = 4 10-7 T m/A)
A) 2.7 10-5 N repulsive
B) 7.2 10-5 N repulsive
C) 3.4 10-5 N attractive
D) 2.7 10-5 N attractive
E) 7.2 10-5 N attractive
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