What will be the total flux through the faces of the cube as shown in figure with side of length $\mathrm{a}$. If a charge $\mathrm{q}$ is placed at-

$\left(\mathrm{a}\right) \mathrm{A}:$ A corner of the cube.
$\left(\mathrm{b}\right) \mathrm{B}:$Mid-point of an edge of the cube.
$\left(\mathrm{c}\right) \mathrm{C}:$Center of the face of the cube.
$\left(\mathrm{d}\right) \mathrm{D}:$Midpoint of B and C.

 

 

The figure presents a crystal unit of cesium chloride,$\mathrm{CsCl}$. The cesium atoms, represented by open circles are situated at the comers of a cube of side $0.40 \mathrm{nm}$, whereas $\mathrm{Cl}$ atom is situated at the center of the cube. The $\mathrm{Cs}$atoms are deficient in one electron while the $\mathrm{Cl}$ atom carries an excess electron. What is the net electric field on the $\mathrm{Cl}$ atom due to eight $\mathrm{Cs}$ atoms ?

The figure represents a crystal unit of cesium chloride,$\mathrm{CsCl}$. The cesium atoms, represented by open circles are situated at the corners of a cube of side $0.40 \mathrm{nm}$, whereas  $\mathrm{Cl}$ atom is situated at the centre of the cube. The $\mathrm{Cs}$atoms are deficient in one electron while the atom carries an excess electron.
Suppose that the $\mathrm{Cs}$ atom at the corner A is missing. What is the net force on the $\mathrm{Cl}$atom due to seven remaining $\mathrm{Cs}$atoms?

Figure shows the electric field lines around three point charges $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$. Which charges are positive?

The figure shows the electric field lines around three-point charges $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$. Which charge has the largest magnitude?

The figure shows the electric field lines around three-point charges $\mathrm{A}, \mathrm{B}$and $\mathrm{C}$. In which region or regions of the picture could the electric field be zero? Justify your answer.