Electrostatics ...

In Millikan\'s oil drop experiment an oil drop carrying a charge Q is held stationary by a potential difference 2400 V between the plates. To keep a drop of half the radius between the plates. To keep a drop of half the radius stationary the potential difference had to be made 600V
What is the charge on the second drop?

A charge of 5C experience a force of 5000 N when it is kept in a uniform electric field. What is the potential difference between two points separated by a distance of 1 cm?

Two insulated charged conducting spheres of radii 20 cm and 15 cm respectively and having an equal charge of 10 C are connected by a copper wire and then they are separated. Then

Equal charges q are placed at the vertices A and B of an equilateral triangle ABC of side a. The magnitude ofelectric field at the point C is

Two equal charges q are placed at a distance of 2a and a third charge –2q is placed at the midpoint. The potential energy of the system is

The unit of intensity of electric field is

The electric potential at a point in free space due to a charge Q coulomb is Q × 10¹¹volts. The electric field atthe point is

A charge of 5C is given a displacement of 0.5 m. The work done in the process is 10J. The potential difference between the two points will be