(a) the force between two conducing spheres is not exactly given by the expression, `Q_(1)Q_(2)//4nin_(0)r^(2)` , because there is a non-uniform charge distribution on the spheres. (b) Gauss's law will not be true, if coloumb's law involved `1//r^(3)` dependence, instead of `1//r^(2)` , on r. <br> (c) Yes, if a small test charge in released at rest at a point in an electrostatic field configuration, then it will travell along the field lines passing through the point, only if the field lines are straight . this is because the field lines give the direction of acceleration and not of velocity. <br> (d) whenever the electron completes an orbit, either circular or elleptical , the work doen by the field of a nucleas is zero. <br> (e) no <br> Electric field is discontinous across the surface of a charged conductor. however, electric potential is continous. <br> (f) the capacitance of a single conductors is considered as a parallel plate capacitor with one of its two plates at infinity. <br> (f) the capacitance of a single conductor is considered as a parallel plate capacitor with one of its two plates at infinity. <br> (g) water has an unsymmetrical space as compared to mica. since it has a permanent dipole moment, it has a greater dielectric constant than mica.