Figure shows the electric field lines around three point charges $A$, $B$ and $C$.

Which charges are positive?

Figure shows the electric field lines around three point charges $A$, $B$ and $C$.

Which charge has the largest magnitude? Why?

Figure shows the electric field lines around three point charges $A$, $B$ and $C$.

Five charges, $q$ each are placed at the corners of a regular pentagon of side $a$.

What will be the electric field at $O$, the center of the pentagon?

Five charges, $q$ each are placed at the corners of a regular pentagon of side $a$.

What will be the electric field at $O$ if the charge from one of the corners (say $A$) is removed?

Five charges, $q$ each are placed at the corners of a regular pentagon of side $a$.

What will be the electric field at $O$ if the charge $q$ at $A$ is replaced by $-q$ ?

Five charges, $q$ each are placed at the corners of a regular pentagon of side $a$.

What will be the electric field at the center, if the pentagon is replaced by $n$-sided regular polygon with the charge $q$ at each of its corners?

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?

Consider the four field patterns shown. Assuming there are no charges in the regions shown, which of the patterns represents a possible electrostatic field?