## IMPORTANT FIVE MARKS QUESTIONS FOR CLASS XII

1. Derive an expression for the Electric field at a point on the (i) axial line and (ii) equatorial line of an electric dipole
2. Describe the principle construction and working of Van de Graff Generator.
3. State Gauss’ theorem and apply it to find the electric field at a point due to
1. A point charge
2. A line of charge
3. A plane sheet of charge
4. A charged spherical conducting shell
Derive expression for the potential energy of a system of point charges. Derive expression for the torque on a dipole in a uniform electric field. Derive expression for the work done in turning a dipole in a uniform electric field. Derive an expression for the potential energy of a dipole in a uniform electric field. Explain the principle of a parallel plate capacitor Derive an expression for the capacitance of a parallel plate capacitor.

10.  Derive an expression for the effective capacitance when three capacitors are connected in (i) series (ii) parallel

11.  Derive an expression for the energy stored in a parallel plate capacitor.

12.