At a particular point, electric field depends upon

Electric field due to a single charge 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

Electrostatic potential V at a point, distant r from a charge q varies as

1 G eV = x eV, where x is

What is the cause of charging?

An isolated conducting sphere is given a positive charge. Does its mass increase, decrease or remain the same?

An ebonite rod is rubbed with fur or wool. What type of charges do they acquire?

What is meant by quantization of charge?

What do you mean by additivity of electric charge?

Give four properties of electric charges.

What is the importance of expressing coulomb's law in vector form?

what is the direction of field intensity at a point
(i) on axial line of dipole and
(ii) on equatorial line of dipole ?

What is the nature of symmetry of the electric field due to
(i) point charge and
(ii) electric dipole?

When an electric dipole is suspended in a uniform electric field, then under what conditions the dipole is in
(i) stable equilibrium and
(ii) unstable equilibrium.

A spherical conductor of radius 12 cm has a charge of 1.6 ​​​​​​\(\times\)10 ⁷C distributed uniformly on its surface. What is the electric field.
(a) inside the sphere
(b) just outside the sphere
(c) at point 18 cm from the centre of the sphere?

Three capacitors each of capacitance 9 pF are connected in series.
(a) What is the total capacitance of the combination?
(b) What is the potential difference across each capacitor, if the combination is connected to a 120 volt supply?

A spherical conducting shell of inner radius r₁ and outer radius r ₂ has a charge Q:
(a) A charge q is placed at the centre of the shell. What is the surface charge density on the inner and outer surfaces of the shell?
(b) Is the electric field in a cavity zero even if the shell is not spherical, but has any irregular shape? Explain.

Two charged conducting spheres of radii a and b are connected to each other by a wire. What is the ratio of electric fields at the surface of the two spheres? Use the result obtained to explain why charge density on the sharp and pointed ends of a conductor is higher than on its flattened portions?

What is the area of the plates of a 2F parallel plate capacitor given that the separation between the plates is 0.5 cm? You will realise from your answer why ordinary capacitors are in the range of\(\mu F\) or less.However, electrolytic capacitors do have a much larger capacitance (0.1F) because of very minute separation between the conductors.

Define electric field at a point. An electron moves a distance of 6.0 cm when accelerated from rest by an electric field of strength \(2\times {{10}^{4}} N{{C}^{-1}}\). Calculate the times of travel.

A and B are two students in a class who have been assigned to arganise a Republic day function. They have also been instructed to invite personally more than 60 members from all the nearby cultural organisations and VIPs in their area. While student A arranged invitations using a photocopier/fax, students B arranges invitations by writing to them individually.
Answer the following questions based on the above information.
(i) Which student's method would you adopt and why?
(ii) State the principle behind the source used by student A.
(iii) How this principle works?

Two point charges q₁ and q₂ at a separation r in vacuum exert a force F on each other. What should be their separation in an oil of a relative permittivity 16 so that the force between them remains F only?

What should be charge on a sphere of radius 2cm so that when it is brought in contact with another sphere of radius 5cm carrying a charge of \(10\mu C\), there is no net transfer of charge between the spheres?