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 - Physics

Answer in Brief

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.



According to Gauss’s law, the electric field between a sphere and a shell is determined by the charge q1 on a small sphere. Hence, the potential difference, V, between the sphere and the shell is independent of charge q2. For positive charge q1, the potential difference V is always positive.

Concept: Van De Graaff Generator
  Is there an error in this question or solution?
Chapter 2: Electrostatic Potential and Capacitance - Exercise [Page 91]


NCERT Physics Class 12
Chapter 2 Electrostatic Potential and Capacitance
Exercise | Q 2.35 | Page 91
NCERT Physics Class 12
Chapter 2 Electrostatic Potential and Capacitance
Exercise | Q 36 | Page 92


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∈02, where r is the distance between their centres?

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.)

In Van de Graaff generator potential difference is produced which is in the order of ______

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 ____________.

...X... is a machine that can build up high voltages of the order of a few million volts. Here, A refers to ______.

In case of a Van de Graaff generator, the breakdown field of air is ________.

Van de Graaff generator is used to _______.

Which of the following is/are true about the principle of Van de Graaff generator?

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.


      Forgot password?
Use app×