2018
PHYSICS
(Theory) full marks :70 pass marks:21
1. (a) Which quantity associated with light wave sets the limit of ability distinguish very close objects?
(b) What is attenuation of signal in communication system?
(c) ICs can be grouped in two categories. What are they?
(d) What is impact parameter?
(e) Which layer in our atmosphere protects us from ultra violet rays?
(f) What is Current Sensitivity of a galvanometer?
(g) Which experiment established the fact that electric charge is quantized?
(h) How are eddy currents minimized in a transformer?
2. (a) Give the statement of Coulomb’s law for the force between two point charges. Write this law in vector notation for two point charges of same magnitude and opposite sign separated by a distance r in vacuum.
Or
Two point charges 0.01 u C and –0.01 u C are placed 10 cm apart in vacuum. Calculate the magnitude of electric field intensity at the middle point of the line joining the charges and mention direction.
(b) Define drift velocity of free electrons in a conductor across which a potential difference is applied. How is related to mobility?
