coduction

Draw the pattern of electric lines, when a point charge - Q is kept near an uncharged coducting plate.

The electric field at a distance 2 cm from the centre of a hollow sphereical coducting shell of radus 4 cm having a charge of 2xx10^C on its surface is

An infinitely long hollow coducting cylinder with inner radius R/2 and outer radus R carries a uniform current density along its length. The magnitude of the magnetic field |B| as a function of the radial distance r from the axis is best represented by

Two concentric coducting thin spherical shells A and B having radii r_A and r_B(r_Bgtr_A) are charged to Q_A and -Q_B(|Q_B|gt|Q_A|) . The electrical field along a line passing through the centre is

A point charge q is located at the centre O of a spherical uncharged coducting layer provided with small orifice. The inside and outside radii of the layer are equal to a and b respectively. The amount of work that has to be performed to slowly transfer the charge q from teh point O through the orifice and into infinity is

A coducting circular loop of area 1mm^2 is placed coplanarly with a long, straight wire at a distance of 20 cm from if. The straight wire carries an electric current which changes from 10A to zero is 0.1 s. Find the average emf induced in the loop in 0.1 s.

Charge 'q' is uniformly distributed along the length of a non-coducting circular ring of mass m and radius 'a'. The ring is placed concentrically magnetic field B=kt (where k is constant) is existing perpendicular to the plane of circular region of radius 'R' as shown. The minimum coefficient of friction between the ring and the surface required to keep the ring stationary is

In a photodiode the coductivity increases when the material is exposed to light. It is found that coductivity change only if the wavelength is less than 600nm . What is the band gap?

What is the change in resistance and electrical coductivity of a semiconductor, when its temperature is increased ?