An Electron with an initial speed of 500,000m/s is brought to rest by an electric field
a)did the electron move into a region of higher or lower potential? I
b) what was the potential difference that stopped the electron?
The Attempt at a Solution
a) my logic: if the electron is brought to rest that would mean the thing creating the electric field would be negative (since like charges repel each other). So I am imagining something like Electric Field.jpg attached.
Since I know that ΔV=ΔU/q, an electron would have a very high potential energy when near a negative plate (like in my pic). That means the closer it travels in the direction of the charged plate it is gaining electric potential based on the equation ΔV=ΔU/q, since q is not changing.
So I believe the electron traveled from a region of lower electric potential to higher electric potential.
when the problem states "did the electron move into a region of higher or lower potential" they are saying electric potential, correct? just want to clarify
combining these equations:
the electrons is brought to rest so vf=0
so the equation becomes:
Why do we have to use -e for electron? I know the charge on an electron is -1.602x10^-19, however I remember in the last few chapters when talking about electric fields etc sometimes we didn't have to use the negative value of the electron