A spherical conductor $A$ is placed concentrically inside a hollow spherical conductor $B$. The charge $+Q$ is given to $A$ and $B$ is earthed. Then the electric field is not zero

A charge $q$ sits at the black corner of a cube as shown in the following figure:

What is the electric flux through the shaded side?

A total charge $Q$ is uniformly distributed over a long rod $\mathrm{AB}$ of length $L$ as shown in the figure below. The electric potential at the point $\mathrm{O}$ lying at a distance $\frac{L}{2}$ from the end $\mathrm{A}$ is

The following figure shows two point charges $+q$ and $-q$ and a metal rod of length $L$ carrying a charge $-q$ with a part $\frac{L}{3}$ of its length inside a cubical box. The electric flux linked with the box will be,

Two equal point charges of $1 \mu \mathrm{C}$ each are located at points $(\hat{\mathrm{i}}+\hat{\mathrm{j}}+\hat{\mathrm{k}}) \mathrm{m}$ and $(2\hat{\mathrm{i}}+3\hat{\mathrm{j}}-\hat{\mathrm{k}}) \mathrm{m}$. What is the magnitude of electrostatic force between them?

Three infinite long plane sheets of uniform charge densities, ${\sigma }_1=-5\sigma \text{,} {\sigma }_2=+2\sigma$ and ${\sigma }_3=3\sigma$ are placed parallel to each other as shown in the figure below. The electric field at point $P$ will be,