Three electric point charges `q_0,q_1` and `q_2` are at distances `vect r_0,vec r_1` and `vec r_2` respectively with respect to same origin. What is the force on charge `q_0` in the filed of charges `q_1` and `q_2` ?

What is the potential energy of a charge q in a given filed?

What is an electric field line? Two point charges +q and -q are separated by a certain distance. Draw the field lines.

The volume charge density within a volume is rho(r ) . What is the force on a small test charge q_0 placed outside the volume having position vector vector r_0 with respect to the same origin considered to specify the position vector of the charge distribution within the volume.

Give the expression for potential energy of a system of two charges q_1 and q_2 in an external field.