(a)Discuss electric field of point charges, keeping in view the magnitude of force acting on test charge according to Coulomb's Law. [8]
(b)Derive Poisson's equation from Gauss's Law. Also write the expression for Laplace's equation. [8]
(c)Find out the electric field due to charge of 2e at a distance of 26.5 x10-12 m. (E₀ =8.85x10-12 C²/N.m² and e=1.60x10-19 C) [4]
(20)
Q. 3
(a)Discuss in details the Energy Transport and the Poynting Vector. [8]
(b)Write the four Maxwell's Equations both in integral and differential forms. [8]
(c)Explain vector potential. [4]
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Q. 4
(a)State and explain Heisenberg's Uncertainty Principle. [8]
(b)Discuss the phenomenon Barrier Tunneling. [8]
(c)Find the momentum of an electron moving with a speed of 1.88 x 10⁰ m/s. where mass of electron is 9.11 x 10-31 kg. [4]
(20)
Q. 5
(a)What do you understand by the term Dopping? How we can make semiconductors as n-type or p-type with the dopping? [8]
(b)Discuss in details the N-P-N and P-N-P transistors. [8]
(c)Explain MOFET. [4]
(20)
Q. 6
(a)Discuss in detail the process of Natural Radioactivity. [8]
(b)Discuss in detail the radioactive decay. [8]
(c)Find the energy released during the alpha-decay of 238 U. Where the needed atomic masses are 238U 238.050785 u, 234Th 234.043539 u and He 4.002603 u. [4]
(20)
Q. 7
(a)Discuss in detail the phenomenon of Fission. [8]
(b)Explain the basic principles of Nuclear Reactors. [8]
(c)Briefly write about the methods of detection of nuclear radiation. [4]
(20)
Q. 8
Write notes on any TWO of the following:
(a)Dielectric medium and Electric Polarization [10]
The 2020 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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