An uncharged sphere of metal is placed in between two charged plates as shown. The lines of force look like
$A$
$B$
$C$
$D$
A point charge $ + q$ is placed at the centre of a cube of side $L$. The electric flux emerging from the cube is
The electric field components in Figure are $E_{x}=\alpha x^{1 / 2}, E_{y}=E_{z}=0,$ in which $\alpha=800 \;N / C\, m ^{1 / 2} .$ Calculate
$(a)$ the flux through the cube, and
$(b)$ the charge within the cube. Assume that $a=0.1 \;m$
The given figure gives electric lines of force due to two charges $q_1$ and $q_2$. What are the signs of the two charges?
Explain the electric field lines and the magnitude of electric field.
$(a)$ An electrostatic field line is a continuous curve. That is, a field line cannot have sudden breaks. Why not?
$(b)$ Explain why two field lines never cross each other at any point?