Explain with the help of suitable diagram the two important processes that occur during the formation of p-n junction. Hence define the terms : depletion region and barrier potential.

Write the two processes that take pIace in the formation of a p-n junction. ExpIain with the heIp of a diagram, the formation of depIetion region and barrier potentiaI in a p-n junction.

Two long straight parallel conducts carrying steady currents I_(1) and I_(2) are separated by a distance d. Explain briefly with the help of suitable diagram, how the magnetic field due to one conductor acts on the other. Hence deduce the expression for the force acting between the two conductors. Mention the nature of this force.

Direction : These question have statement I and statement II. Of the four choices given below choose the one that best describes the two statements. Statement I: The depletion of thermal layer is also generated at the junction of a p-n junction diode without any applied biasing. Statement II. The diffusion of thermal electrons and holes takes place from one region to another.

The light from a clear blue portion of the sky shows a rise and fall of intensity when viewed through a polaroid which is rotated. Describe, with the help of a suitable diagram, the basic phenomenom/process which occurs to explain this observation.

A Zener diode is fabricated by heavily doping both p and n-sides of the junction. Explain why? Briefly explain the use of Zener diode as a dc voltage regulator with the help of a circuit diagram.