A proton is released from rest in a region ofspace with a nonzero electric field. (a) As the proton moves, doesthe electric potential energy of the system increase, decrease, orstay the same? (b) Choose the best explanation:I. As the proton begins to move, its kinetic energy increases. Theincrease in kinetic energy is equal to the decrease in the electric potential energy of the system.II. Because the proton has a positive charge, its electric potentialenergy will always increase.III. The proton will move perpendicular to the electric field, andhence its electric potential energy will remain the same

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.