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A positive charge of 4.00 μC is fixed in place. From a distance of 4.90 cm...

A positive charge of 4.00 μC is fixed in place. From a distance of 4.90 cm a particle of mass 5.10 g and charge +3.60 μC is fired with an initial speed of 78.0 m/s directly toward the fixed charge. How close to the fixed charge does the particle get before it comes to rest and starts traveling away?

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Answer #1

Concept - the initial energy will be the sum of potential energy and kinetic energy. Final energy will only consist of potential energy because the charge comes to rest. We use conservation of energy principle to find the closest distance of approach as shown below,

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