ANSWER:
5.58*10^-11 N/C, downward
STEP-BY-STEP EXPLANATION:
Given:
m = 9.11 x 10^-31 kg
The electric force can be calculated as follows:
[tex]\begin{gathered} F=qE \\ \text{ we solve for E} \\ E=\frac{F}{q} \\ F=W=m\cdot g \\ \text{ we replacing} \\ E=\frac{mg}{q} \end{gathered}[/tex]We substitute the values, knowing that the acceleration is 9.8 m/s^2 and q is equal to 1.6*10^-19 C, therefore:
[tex]\begin{gathered} E=\frac{9.11\cdot10^{-31}\cdot9.8}{1.6\cdot10^{-19}} \\ E=\: 5.58\cdot10^{-11}\text{ N/C} \end{gathered}[/tex]Which means that the magnitude is equal to 5.58*10^-11 N/C and with downward direction
