A charge 20.91 mC is placed to the left of another charge 71.23 mC on a plane, a

Question

A charge 20.91 mC is placed to the left of another charge 71.23 mC on a plane, as shown in the figure. Another charge of -9.051 ?C and mass 35.31 g (depicted as a blue sphere) is placed at rest at a distance 30.74 cm above the right-most charge and released. What is the speed of the -9.051 ?C charge if it reaches the gray position labeled A?

A charge 20.91 mC is placed to the left of another charge 71.23 mC on a plane, as shown in the figure. Another charge of -9.051 mu C and mass 35.31 g (depicted as a blue sphere) is placed at rest at a distance 30.74 cm above the right-most charge and released. What is the speed of the -9.051 mu C charge if it reaches the gray position labeled A?

Explanation / Answer

find the electic potentials at the two points and their difference, and consequently loss of potential energy, equate the potential energy loss to kinetic energy and you will get the speed

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