Advertisements
Advertisements
Question
Two large conducting spheres carrying charges Q1 and Q2 are brought close to each other. Is the magnitude of the electrostatic force between them exactly given by Q1 Q2/4π∈0r 2, where r is the distance between their centres?
Advertisements
Solution
The force between two conducting spheres is not exactly given by the expression, Q1 Q2/4π∈0r 2, because there is a non-uniform charge distribution on the spheres.
RELATED QUESTIONS
In a Van de Graaff type generator a spherical metal shell is to be a 15 × 106 V electrode. The dielectric strength of the gas surrounding the electrode is 5 × 107 Vm−1. What is the minimum radius of the spherical shell required? (You will learn from this exercise why one cannot build an electrostatic generator using a very small shell which requires a small charge to acquire a high potential.)
A small sphere of radius r1 and charge q1 is enclosed by a spherical shell of radius r2 and charge q2. Show that if q1 is positive, charge will necessarily flow from the sphere to the shell (when the two are connected by a wire) no matter what the charge q2 on the shell is.
Van de Graaff generator produces ______.
An electric dipole has a fixed dipole moment `vec "p"`, which makes angle `theta` with respect to x-axis. When subjected to an electric field `vec"E"_1 = "E"hat"i"`, it experiences a torque `vec "T"_1 = tau hat"k"`. When subjected to another electric field `vec "E"_2 = sqrt3 "E"_1 hat "j"` it experiences torque `vec "T"_2 = ~ vec "T"_1` The angle `theta` is ____________.
Van de Graaff generator ______
What is the Van de Graaff generator?
State the Van de Graaff generator principle of working.
Explain the process of corona discharge.
