I have a negative infinite sheet of charge moving at a velocity $v$ in the $+x$ direction. A test charge $Q$ with mass $m$ moves at a constant velocity $v$.
My Question is simple: How will the test charge $Q$ move? Will it keep going in the $+x$ direction at a constant velocity $v$, as if no electromagnetic forces act on it? Will it go in a diagonal motion? Did I even get the Force-Body Diagram right?
With Gauss' Law and a Cylinder as my Gaussian Surface & Ampere's Law and a Rectangle as my Amperian Loop, I've found that
$$\begin{array}{l}
\vec{F}=Q(\vec{E}+\vec{v} \times \vec{B}) \\
\vec{F}=Q\left(\frac{\sigma}{2 \varepsilon_{0}}-\vec{v} \times \frac{\mu_{0} \sigma_{s}}{2}\right) \rightarrow \vec{F}=Q\left(\frac{\sigma}{2 \varepsilon_{0}}-\frac{\mu_{0} v^{2} \sigma}{2}\right).
\end{array}$$
Taking the integral gives me $\vec{r}(t)=\vec{y}(t)=\hat{j} \frac{Q \sigma t^{2}}{4 \varepsilon_{0} m}\left(1-\frac{v^{2}}{{{(\mu}_{0}{\varepsilon}_{0})}^{2}}\right)$
My equations don't meet my intuition -- shouldn't the positive test charge just slam into the negative sheet of charge due to the electrostatic attraction? Again, my main question is: How will $Q$ actually move?