## ELECTROSTATICS (Module 2)

- Define electric field.
- Define electric field strength (intensity of electric field).
- What is an electric dipole?
- Define electric dipole moment.
- Is the electric dipole moment a scalar or a vector quantity?
- What is the direction of electric dipole moment?
- What is the unit of electric dipole moment?
- What are electric field lines?
- State the characteristics of electric field lines.
- Why two electric field lines never intersect each other?
- Comment on the statement, “The electric field lines (electric lines of force) are imaginary, but what they represent is a reality”
- Electric lines of force always enter or emerge normal to the surface of a conductor, justify.
- What is the ratio of electric field strengths on axial position to equatorial position if both the points are at the same distance from the centre of the dipole?
- What is the angle between the electric field at a point on the axial position and the electric field at a point on the equatorial position?
- Write the expression for torque on a dipole in a uniform electric field.
- Which are the positions of minimum torque and maximum torque of an electric dipole in a uniform electric field?
- Write the expression for work done in rotating a dipole in a uniform electric field.
- Write the expression for potential energy of a dipole in a uniform electric field with its axis making an angle θ with the electric field.
- Define electric flux.
- State Gauss’ law
- Compare the variation of electric field strength with distance in the case of (a) a point charge (b) a dipole (c) a uniformly charged long straight wire and (d) a uniformly charged infinite plane sheet of charge.
- What is a Gaussian surface?
- State the principle of superposition of electric fields
- Which are the positions of (a) stable equilibrium and (b) unstable equilibrium of a dipole in a uniform electric field?
- Which are the positions of maximum potential energy and minimum potential energy of an electric dipole in a uniform electric field?

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