Electric field intensity (E) due to an electric dipole varies with distance (r) of the point from the centre of dipole as:

The correct relation between electric intensity E and electric potential V is 

A closed surface in vacuum encloses charges -q and +3q. Another charge -2q lies outside the surface. Total electric flux over the surface is 

The electric field at a point is

Dipole moment is a ............... quantity and its units are .............

An electrostatic field line is continuous curve, i.e. a field line cannot have sudden breaks. Why not?

The SI unit of electric field intensity is 

When an electric dipole is held at an angle in a uniform electric field, the net force F and torque \(\tau\) on the dipole are

Charge on a body which carries 200 excess electrons is

What do you mean by conservation of electric charge?

Give four properties of electric charges.

Two point charges of +2 \(\mu C\) and +6 \(\mu C\) repel each other with a force of 12N. If each is given an additional charge of -4\(\mu C\) , what will be the new force?

The given figure shows tracks of three charged particles in a uniform electrostatic field. Give the signs of the three charges. Which particle has the highest charge to mass ratio?

Find the magnitude of the resultant force on a charge of \(1\mu C\) held at P due to two charges of \(+2\times { 10 }^{ -8 }C\quad and\quad -{ 10 }^{ -8 }C\) at A and B respectively. Given, AP = 10 cm and BP = 5 cm. \(\angle APB={ 90 }^{ o }\)

Using Gauss's theorem, deduce an expression for the electric field intensity at any point due to a thin, infinitely long wire of charge/length '\(\lambda\)' C\m

Derive the expression for electric field at a point on the equatorial line of an electric 
dipole. Depict the orientation of the dipole in
(a) stable,
(b) unstable equilibrium in a uniform electric field.

(a) Define electric flux. Write its S.I. unit.
(b) Using Gauss's law, prove that the electric field at a point due to a uniformly charged infinite plane sheet is independent of the distance from it.
(c) How is the field directed if
(i) the sheet is positively charged,
(ii) negatively charged?