# III B.Sc.: Physics Semester V- Paper V Electricity, Magnetism and Electronics (Model Paper) 2017

 III B.Sc.: Physics  Semester V  Paper V Electricity, Magnetism and Electronics (Model Paper) 2017 SECTION – A I. Answer any FIVE of the following questions: 5 x 5 = 25 M 1. Derive the relation among D, E and P. 2. Derive expression for the potential due to a point charge. 3. What is Hall Effect ? Write the applications of Hall Effect. 4. Derive an expression for the self inductance of a long solenoid. 5. Write the integral an differential forms of Maxwell’s equations. 6. Calculate the resonance frequency of a LCR series circuit with a resistance 10W inductance 20 mH and a capacitance of 0.02 mF. 7. For a transistor a = 0.95 and its emitter current is 1 mA. Find its base and collector currents. 8. Convert following Binary to Decimal. SECTION – B II. Answer ALL of the following questions: 5 x 10 = 50 M 9. a) State and prove Gauss’s law. (OR) b) Explain the boundary conditions at the dielectric surface. 10. a) State and explain Biot–Savart’s law. Derive an expression for the magnetic induction at a point o the axis of a current carrying solenoid. (OR) b) Describe the construction and working of a transformer. Explain its energy losses. 11. a) Describe the behaviour of series LCR circuit when an alternating voltage is applied to it. Explain the condition for resonance. (OR) b) Derive the equation of electromagnetic wave and hence determine the velocity of propagation of electromagnetic wave in free space. 12. a) What is transistor ? Explain the working of PNP and NPN Transistor. (OR) b) Explain the CE characteristics of a Transistor. 13. a) Explain the functioning of a Half Adder and a Full Adder along with respective truth tables. (OR) b) State and prove Demorgan’s laws. Realize AND, OR and NOT gates from NAND logic.

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