In a Van de graph generator the charged-shell haye. potential, `15 xx 10^5` volt. The electric,field outside the shell is `5 xx10^7 Vm^(-1)`. What is the minimum radius of shell?,

In a Van de Graaff generator a spherical metal shell in to be a 15xx10^(6)V electrode. The dielectric strength of the gas surrounding the electrode is 5xx10^(7)V*m^(-1) . What is the minimum radius of the spherical shell required?

Two parallel plates of area 100 cm^2 are given equal and opposite charges of 10^(-7)C . The space between the plates is filled with a dielectric material, and the electric field within the dielectric is 3.3xx10^5 V. m^(-1) . What is the dielectric constant of the dielectric?

Two parallel plates of area 100 cm^2 are given equal and opposite charges of 10^(-7)C . The space between the plates is filled with a dielectric material, and the electric field within the dielectric is 3.3xx10^5 V. m^(-1) . What is the total induced charge density on either face of the dielectric?

In a region of free space the average electric field of an electromagnetic wave is 9 xx 10^-4 NC^-1 . What is the magnetic field in that region?

Suppose that the source of earth's magnetism is a magnetic dipole at the earth. Find the moment of this magnetic dipole if the strength of earth's magnetic field at the equator is 4xx10^(-5) T . Given , radius of the earth 6.4xx10^(6)mand(mu_(0))/(4pi)=10^(-7)T.m.A^(-1) .

A conducting sphere of radius 10 cm has an unknown charge. If the electric field 20cm from the centre of the sphere is 1.5 xx 10^(3) N.C^(-1) and points radially inward, what is the net charge on the sphere ?

The diameter of a spherical liquid drop is 2 mm and its charge is 5 xx 10^(-6) esu. What is the potential on its surface?

If in air medium the amplitude of the electric field is 5 xx 10^-4v//m , then what will be the amplitude of the magnetic field?

An electric field and a mangetic field act at right angles to each other in a region. The electric field is E=10^(5)V.m^(-1) and the magnetic field is B=0.4T. What should be the velcoity of projection of a charge q in a direction perpendicular to both the fields so that it will not be deflected?

For a van der waals gas, b=5.0xx10^(-2)L*mol^(-1) . What is the diameter of a molecule of this gas?