Q10 of 26 Page 1

(a) Distinguish between ‘Analog’ and ‘Digital’ forms of communication.

b) Explain briefly two commonly used applications of the ‘Internet’.


(a)



(b)


i.) E‐commerce: It allows the user to buy or sell the goods through various websites, to make online payments and much more.


ii) E-mail- It allows the exchange of text or graphic material. We can write a letter send scan copy of


documents as attachment and send instantly to the other person.


More from this chapter

All 26 →
8

State the two Kirchhoff’s rules used in electric networks. How are these rules justified?

 9

Given the ground state energy E0 = – 13.6 eV and Bohr radius a0 = 0.53 Å. Find out how the de Broglie wavelength associated with the electron orbiting in the ground state would change when it jumps into the first excited state.

 11

Plot a graph showing the variation of current density (j) versus the electric field (E) for two conductors of different materials. What information from this plot regarding the properties of the conducting material, can be obtained which can be used to select suitable materials for use in making (i) standard resistance and (ii) connecting wires in electric circuits?

Electron drift speed is estimated to be of the order of mm s–1. Yet large current of the order of few amperes can be set up in the wire. Explain briefly.


 12

State Biot – Savart law. Deduce the expression for the magnetic field at a point on the axis of a current carrying circular loop of radius ‘R’, distant ‘x’ from the centre. Hence write the magnetic field at the centre of a loop.