c) What are the exact location, magnitude, and sign of the charge qC that will result in force balance for all three particles? (Note: even if you indicated the sign of the charge in parts (a) and/or (b), make sure you indicate it here as well.)

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Helmholtz Free Energy

The Helmholtz free energy is a thermodynamic potential used to calculate the measure of useful work from a closed system. This system is kept at constant temperature and volume. German physicist Hermann Helmholtz introduced this concept in 1882.