In a uniform electric field, if a negatively charged particle is moving in the direction of the electric field, wouldn't that mean that the potential energy increases? Since it is moving towards a negative plate. The answer to the question in my notes is that the kinetic energy increases when moving in the same direction as the electric field.

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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.