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An electron is initially at rest in a uniform electric field having a strength of 1.95...

An electron is initially at rest in a uniform electric field having a strength of 1.95 × 106 V/m. It is then released and accelerated by the presence of the electric field.

What is the change in the electron’s kinetic energy, in kiloelectron volts, if it travels over a distance of 0.25 m in this field?

Over how many kilometers would it have to be accelerated in the same electric field to increase its kinetic energy by 65 GeV?

&

  In a model of the hydrogen atom, the electron travels in circular orbits around the proton.

What is the electric potential, in volts, due to the proton on an electron in an orbit with radius 4.81 × 10–10 m?

&

  A 0.85 cm diameter plastic sphere, used in a static electricity demonstration, has a uniformly distributed 36 pC charge on its surface.

What is the electric potential near its surface, in volts?

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