(a)Define and explain Gauss' Law. Deduce Coulomb's Law from Gauss' Law. [8]
(b)Find the Electric Field Intensity due to an infinite sheet of charge. [8]
(c)The electric field near an infinite sheet of charge is 3.84× 10 5 N/C. What is the surface charge density on the sheet? ( ε 0 = 8.85× 10 -12 C 2 /N. m 2 ) [4]
(20)
Q. 3
(a)Derive an expression for capacitance of cylindrical and spherical capacitor. [8]
(b)Show that the energy consumed in charging a capacitor to charge Q and voltage V can be considered as potential energy stored in the field between the plates. Find expression for energy stored in the field. [8]
(c)An isolated conducting sphere whose radius R is 6.85 cm has a charge q=1.25 nC. How much potential energy is stored in the electric field of this charged conductor? ( ε 0 = 8.85× 10 -12 C 2 /N. m 2 ) [4]
(20)
Q. 4
(a)Derive an expression for time dependent Schrodinger's wave equation. [8]
(b)Explain de Broglie's hypothesis of matter wave. [8]
(c)Determine the de Broglie's wavelength of an electron that has been accelerated through a potential difference of 100V. (h= 6.63× 10 -34 J.s) [4]
(20)
Q. 5
(a)What is Transistor? Briefly explain three types of Transistor Circuit Configurations. [8]
(b)Draw a neat diagram of Transistor Characteristics in Common Emitter Configuration for P-N-P and N-P-N transistor. Also discuss types of characteristic curves for a transistor in Common Emitter Configuration. [8]
(c)Write a short note on Load line. [4]
(20)
Q. 6
(a)What do you understand by nuclear fission? How was it explained theoretically on the basis of liquid drop model? [8]
(b)Briefly describe important uses of radioisotopes. [8]
(c)A 5.30 MeV alpha particle happens, by chance, to be headed directly towards the nucleus of an atom of gold, which contains 79 protons. How close does the alpha particle get to the centre of the nucleus before coming momentarily to rest and reversing the relatively massive nucleus? [4]
(20)
Q. 7
(a)Explain construction and working of a Geiger Muller Counter. [8]
(b)Draw the characteristic of Geiger Muller Counter and also explain it. [8]
The 2018 CSS Physics paper set by the FPSC. Question wording only; questions marked “Not yet checked” have not been compared with the official paper yet.
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