4. Case 3: A positive charge Q sits fixed in pla distance, d, away from Q. Case 4: A positive charge Q sits fixed in place. A negative test charge -q is released from rest a distance, d, away from Q. Case 3 Source Case 4 Charge Test Charge Source Charge Test Charge +9 d d How does the potential energy of the system behave in these cases after the charge is released? a. In both cases, the potential energy increases. b. In both cases, the potential energy decreases. C. In case 3 the potential energy increases, but in case 4 it decreases. In case 3 the potential energy decreases, but in case 4 it increases. The potential energy is conserved in both cases.