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A particle with a mass of 2 g and a charge of +6 μC is released...

A particle with a mass of 2 g and a charge of +6 μC is released from rest at a distance of 20 cm from another particle with a charge of +19 μC, which is held fixed. How fast is the moving particle traveling when it is 159 cm away from the fixed particle?

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Answer #1

Initially the particle is at rest. The initial energy of the system is only the potential energy of the (system of)two particles.

Initial energy of the system is

Final energy of the system is

By law of Conservation of energy,

Hence, speed of the particle when it is 159 cm away from the fixed particle is

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