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Old Wednesday, May 12, 2010
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Physics Paper 2010
Paper 2
Part II


Q.2 a) State and prove Gauss's law in electrostatics and express the law in differential forms.
b) Find the electricity intensity at a point outside a volume distribution of charge confined into a spherical region of radius R.

Q.3 a) State and explain Ampere's law . Derive an expression for the value of 'B' inside a solenoid.
b) a thin 10 cms long solenoid has a total of 400 turns of wire and carries a current of .20 ampere. Calculate the field inside near the centre.(given μ0 = 12.57 *10 powers-7 T-m/A )


Q.4 a How a semi conductor diode is used as a half wave and full wave rectifier?
b) What are the transistors? Give construction and symbol of PNP and NPN transistor.
c) The resistivity of a metal increases with increase in temperature while that of a semi conductor decreases. Explain

Q.5Discuss briefly the wave number of matter and obtain an expression of de Broglie's wavelength for matter waves.
b) calculate de Broglie's wavelength of a .20 kg ball moving with a speed of 15m/s.

Q.6 a) Derive Einstein's photoelectric effect on the basis of quantum theory and derive Einstein's Photoelectric equations.
b) calculate the work function of NA in electron volts given that the threshold wavelength is 6800. 6.625 * 10-34 J-S

Q.7 a)Define the terms decay constant ,half life and average life as applied to a radioactive substance. Find the relation between them.
b)The half life of radium is 1590 years . In how many years will one gm of pure element
i) lose one centigram
ii) be reduced to one centigram

c) Whena nucleus emitsa gamma ray photon ,what happens to its atomic number and its actual mass.

Q.8 Write notes on any Two:
a) self and mutual inductance
b) Pauli's Exclsusion Principle
c) Compton Scattering
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