## Answer the following: (a) The top of the atmosphere is at about 400 kV with respect to the surface of the earth, corresponding to an electric field that decreases with altitude. Near the surface of the earth, the field is about  100Vm-1 . Why then do we not get an electric shock as we step out of our house into the open? (Assume the house to be a steel cage so there is no field inside!)

Answer the following: (a) The top of the atmosphere is at about 400 kV with respect to the surface of the earth, corresponding to an electric field that decreases with altitude. Near the surface of the earth, the field is about  100Vm-1 Read More …

## A small sphere of radius 1r 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

A small sphere of radius 1r 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 Read More …

## 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 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 Read More …

## Describe schematically the equipotential surface corresponding to (a) a constant electric field in the z-direction,

Describe schematically the equipotential surface corresponding to (a) a constant electric field in the z-direction, (b) a field that uniformly increases in magnitude but remains in a constant (say, z) direction, (c) a single positive charge at the origin, and Read More …

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