**Part A**

$\overline{){\mathbf{F}}{\mathbf{=}}{\mathbf{q}}{\mathbf{E}}}$

$\overline{){\mathbf{W}}{\mathbf{=}}{\mathbf{m}}{\mathbf{g}}}$

q = +1.6 × 10^{-19} C

m = 1.67 × 10^{-27} kg

g = 9.8 m/s^{2}

$\begin{array}{rcl}\mathbf{\Sigma}\mathbf{F}& \mathbf{=}& \mathbf{m}\mathbf{a}\\ \mathbf{qE}\mathbf{-}\mathbf{mg}& \mathbf{=}& \mathbf{0}\\ \mathbf{E}& \mathbf{=}& \frac{\mathbf{m}\mathbf{g}}{\mathbf{q}}\\ & \mathbf{=}& \frac{\mathbf{(}\mathbf{1}\mathbf{.}\mathbf{67}\mathbf{\times}{\mathbf{10}}^{\mathbf{-}\mathbf{27}}\mathbf{)}\mathbf{(}\mathbf{9}\mathbf{.}\mathbf{8}\mathbf{)}}{\mathbf{(}\mathbf{1}\mathbf{.}\mathbf{6}\mathbf{\times}{\mathbf{10}}^{\mathbf{-}\mathbf{19}}\mathbf{)}}\end{array}$

Part A

What is the strength of an electric field that will balance the weight of a proton?

Part B

What is the direction of an electric field that will balance the weight of a proton?

a) upward

b) downward

Part C

What is the strength of an electric field that will balance the weight of an electron?

Part D

What is the direction of an electric field that will balance the weight of an electron?

a) upward

b) downward

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

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