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** Edit: Nevermind. I figured it out using the Work Energy theorem.

An electron is released from rest 1.0 cim above a uniformly charged infinite plane with a charge density of 10

my attempt:

Potential energy when it is released= kinetic energy when it hits.

kqQ/r = 0.5 mv

isolate v:

[tex]

v = \sqrt {\frac{{2kqQ}}{{m \cdot r}}}

[/tex]

This would work if I was given 2 point charges, but how do I do this with a charge density and a point charge?

An electron is released from rest 1.0 cim above a uniformly charged infinite plane with a charge density of 10

^{-9}C/m^{2}. What is the speed of the electron when it hits the plane?my attempt:

Potential energy when it is released= kinetic energy when it hits.

kqQ/r = 0.5 mv

^{2}isolate v:

[tex]

v = \sqrt {\frac{{2kqQ}}{{m \cdot r}}}

[/tex]

This would work if I was given 2 point charges, but how do I do this with a charge density and a point charge?

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