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- Consider a system consisting of two oppositely chargedspheres hanging by strings and separated by a distance r1,as shown in the accompanying illustration. Suppose theyare separated to a larger distance r2, by moving them apart.(a) What change, if any, has occurred in the potential energyof the system? (b) What effect, if any, does this process haveon the value of ΔE? (c) What can you say about q and w forthis process?By what means can the internal energy of a closed system increase?List some examples of enegy.