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An electron with an initial speed of 580,000 m/s is brought to rest by an electric field.

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*Did the electron move into a region of higher potential or lower potential?*

A) Because the electron is a negative charge and it slows down as it travels, it must be moving from a region of higher potential to a region of lower potential.

B) Because the electron is a negative charge and it slows down as it travels, it must be moving from a region of lower potential to a region of higher potential.

C) Because the electron is a positive charge and it accelerates as it travels, it must be moving from a region of lower potential to a region of higher potential.

D) Because the electron is a positive charge and it accelerates as it travels, it must be moving from a region of higher potential to a region of lower potential.

*What was the potential difference that stopped the electron?*

*What was the initial kinetic energy of the electron, in electron volts?*

Relevant knowledge

The energy conservation equation calculates the potential difference between the electron’s last and initial velocity. It is used to determine if one type of energy changes into another.

## 1 Answer