2/3/2011 Subjective Test Paper - Physics - Meritn…
Physics 2009 Set 3 Close
These are additional set 3 questions.
Question 2 ( 1.0 marks)
At what angle of incidence should a light beam strike a glass slab of refractive index , such that
the reflected and the refracted rays are perpendicular to each other?
Question 3 ( 1.0 marks)
What is space wave propagation?
Question 5 ( 1.0 marks)
Name the part of electromagnetic spectrum which is suitable for
(i) radar systems used in aircraft navigation
(ii) treatment of cancer tumours
Question 6 ( 1.0 marks)
Two nuclei have mass numbers in the ratio 2: 5. W hat is the ratio of their nuclear densities?
Question 19 ( 3.0 marks)
State Gauss’ law in electrostatics. Use this law to derive an expression for the electric field due to an
infinitely long straight wire of linear charge density λ Cm−1 .
Question 23 ( 3.0 marks)
Two parallel plate capacitors, X and Y, have the same area of plates and same separation between
them. X has air between the plates while Y contains a dielectric medium of ∈ r = 4.
(i) Calculate capacitance of each capacitor if equivalent capacitance of the combination is 4 µF.
(ii) Calculate the potential difference between the plates of X and Y.
(iii) What is the ratio of electrostatic energy stored in X and Y?