59-- In the figure below, if the magnitude of the electric field at point A is $5\times10^5\ \dfrac{\text{N}}{\text{C}}$, then $|q_1|$ is how many microcoulombs? $\left(k = 9\times10^9\ \dfrac{\text{N.m}^2}{\text{C}^2}\right)$
[(1)] 8
[(2)] 12
[(3)] 16
[(4)] 20
[Figure: Charge $q_1$ is located on the vertical axis, $60\ \text{cm}$ above point A. On the horizontal axis, two charges $q_2 = -4\ \mu\text{C}$ and $q_3 = +4\ \mu\text{C}$ are placed at $30\ \text{cm}$ and $60\ \text{cm}$ from point A respectively.]
\textbf{59--} In the figure below, if the magnitude of the electric field at point A is $5\times10^5\ \dfrac{\text{N}}{\text{C}}$, then $|q_1|$ is how many microcoulombs? $\left(k = 9\times10^9\ \dfrac{\text{N.m}^2}{\text{C}^2}\right)$
\begin{itemize}
\item[(1)] 8
\item[(2)] 12
\item[(3)] 16
\item[(4)] 20
\end{itemize}
\textit{[Figure: Charge $q_1$ is located on the vertical axis, $60\ \text{cm}$ above point A. On the horizontal axis, two charges $q_2 = -4\ \mu\text{C}$ and $q_3 = +4\ \mu\text{C}$ are placed at $30\ \text{cm}$ and $60\ \text{cm}$ from point A respectively.]}
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