An electron is placed a distance of 7.1x10-6m from an unknown charge. The electron is released and moves away from the unknown charge (which is held stationary.) By observing the electron, you deduce that 7.8x10-18J of energy is lost once the electron has arrived at a distance of 2.8x10-4m from the unknown charge. What is the size and sign of the unknown charge?

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Chapter16: Electrical Energy And Capacitance
Section: Chapter Questions
Problem 2CQ: An electron is released from rest in a uniform electric field. Determine whether the following...
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An electron is placed a distance of 7.1x10-6m from an unknown charge. The electron is released and moves away from the unknown charge (which is held stationary.) By observing the electron, you deduce that 7.8x10-18J of energy is lost once the electron has arrived at a distance of 2.8x10-4m from the unknown charge.

What is the size and sign of the unknown charge?

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