Two oppositely charged balls, lying on a flat plastic table, are held at rest with dielectric objects. How will the energy of the electric field change if the balls are released? Does it matter how the balls are charged – of the same name or of the opposite?
Under the influence of the forces of electrical interaction, the balls will approach each other if they are oppositely charged, and move away if they are charged with the same name. Their kinetic energy will increase due to a decrease in the energy of the electric field created by both balls, regardless of the sign of the balls’ charges. This follows from the law of conservation of energy.
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