Question

Section-D
4. (a) What do you understand by drift velocity of free
electron? Deduce Ohm's law on the basis of principle
of drift velocity
(b) The focal lengths of a convex lens and concave lens
are 10 cm and 50 cm respectively. Both lenses are
kept in contact. An object is placed at a distance of 25
cm from this combined lens. Determine the position
of image of the object.
(c) Write down the Kirchhoff's law of current and
voltage.
(d) What are the different components of earth's
magnetism? Define them.
(e) Describe in brief the Davisson-Germer experiment
and write the facts inferred from it.
5.(a) Draw the circuit diagram of p-n junction diode in
forward bias. Plot the characteristic curve and
explain it.
(b) What is meant by polarization of light ? Briefly
describe a method to obtain the plane polarized light.
3




plz...plz...help​

Answer 1

Answer:

focal length of convex lens is positive and focal length of concave lens is negative