Apoint charge of 4.0 µc is placed at a distance of 0.10 m from a hard rubber rod with an electric field of 1.0 × 103 . what is the electric potential energy of the point charge? × 10–4 j what is the electric potential energy of the point charge at 1.3 m? × 10–3 j

Part 1)

Part 2)

Explanation:

Electric field due to rubber rod is given by

now we also know that

now potential energy is given as

Similarly the electric potential at distance r = 1.3 m

so we have

now potential energy is given as

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

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