- #1

Patdon10

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## Homework Statement

2 part problem. I've already solved the first part.

Two parallel plates are held at potentials of +380.0 V and -150.0 V. The plates are separated by 3.00 cm.

a. Find the electric field between the plates.

b. An electron is initially placed halfway between the plates. Find its kinetic energy when it hits the positive plate.

## Homework Equations

E = deltaV/d

W = delta U = qEd

## The Attempt at a Solution

For the first one I plugged into delta V, which was simply 380 - -150 = 530 V.

then took 530V/(0.03m) = 17,666 V/m

the 2nd part isn't working.

q(E)d = (1.6e-19 C)(17,666 V/m)(0.015 m)

= 4.2398 e-17 CV (needs to be in units of eV?)

This answer is wrong. Anyone know what I'm doing it wrong?

by the way. I think it is obvious I'm using the conservation of energy. All potential energy at the start, converts to all kinetic energy at the end.