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(C) The correct option is $C$.When a moving electron approaches another stationary electron,the electrostatic force of repulsion between them acts in

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Decreases,Increases

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(C) The correct option is $C$.When a moving electron approaches another stationary electron,the electrostatic force of repulsion between them acts in the direction opposite to the motion of the moving electron.This repulsive force does negative work on the moving electron,which causes its kinetic energy to decrease.According to the law of conservation of energy,the total energy of the system remains constant.Since the kinetic energy of the moving electron decreases,its potential energy must increase as the distance between the two electrons decreases.

One moving electron when comes closer to another stationary electron,then its kinetic energy and potential energy respectively . . . . . . and . . . . . . .

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