An infinite wire having linear charge density $\lambda$ is arranged as shown in the figure. A charge particle of mass $m$ and charge $q$ is released from point $P$. Find the initial acceleration of the particle (at $t=0$) just after the particle is released.

Is an electric field of the type shown by the electric lines in the figure physically possible?

Figure shows three electric field lines.

At which point, $\mathrm{A}$ or $\mathrm{B}$, will the acceleration of the test charge be greater if the charge is released?

Figure shows that $E$ has the same value for all points in front of an infinitely charged sheet. Is this reasonable? One might think that the field should be stronger near the sheet, because the charges are so much closer

Figure shows the tracks of three charged particles in a uniform electrostatic field projected parallel to a plate with the same velocity. Give the signs of the three charges. Which of the three particles has the highest charge to mass ratio?

Two charged metal plates in vacuum are $10 \mathrm{c}\mathrm{m}$ apart. A uniform electric field of intensity $\left(\frac{45}{16}\right)\times {10}^3 \mathrm{N} {\mathrm{C}}^{-1}$ is applied between the plates. An electron is released between the plates from rest at a point just outside the negative plate.

(a) Calculate how long $\left(t\right)$ will the electron take to reach the other plate.

(b) At what velocity $\left(v\right)$ will it be going just before it hits the other plate?