Auniform electric field of 2 knc-1 is in the x-direction. a point charge of 3 μc initially at rest at the origin is released. what is the kinetic energy of this charge at x = 4m?

The electric force acting on the charge is given by the charge multiplied by the electric field intensity:

where in our problem  and , so the force is


The initial kinetic energy of the particle is zero (because it is at rest), so its final kinetic energy corresponds to the work done by the electric force for a distance of x=4 m:

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