If a proton is moved a certain distance directly opposite an external electric field, then the change in the electric potential it experiences will increase.
Electric potential can be defined as the amount of work needed to move a unit charge from a initial point to a final point against an electric field.
The electric force does positive work on the proton to increase its kinetic energy when a proton moves with the electric field.
Now, if an electron is placed in the electric field, the field will move the electron directly opposite the field moving towards the fixed positive charge.
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