ANDHRA UNIVERSITY
B.Sc. DEGREE EXAMINATION
(Examination at the end of Semester - V
NOVEMBER - 2017
Part II: PHYSICS
Paper - V: Electricity Magnetism and Electronics
Time : 3 Hours] [Max : 75 Marks
Section - A. (5 x 5 = 25 Marks)
Answer any Five from the following Eight questions.
1. State and prove Gauss law in electrostatics.
2. State the boundary conditions at the interface of two dielectrics.
3. What is hall effect? Explain its importance.
4. State and explain Biot-Savart's law.
5. Calculate the resonance frequency of a LCR series circuit with a resistance 10 Ω, inductance 20 mH and capacitance of 0:02 μF.
6. Obtain an expression for the energy stored in a solenoid.
7. For a transistor o. = 0-95 and the emitter current is 1 mA. Find the base and collector currents.
8. Convert the following binary into Decimal.
(a) (10100)
2 (b) (11001)
2
Section - B: (5x 10 =50 Marks)
Answer All questions.
9. (a) Derive expressions for the electric field intensity at a point.
(i) Outside.
(ii) Inside.
(iii) On the surface of a uniformly charged sphere.
(Or)
(b) Define D, E and P. Derive the relation between them.
10. (a) What is hall effect ? Deduce the expression for Hall coefficient. Describe how Hall effect is useful to know the nature of charge carriers ina conductor.
(Or)
(b) Explain self and mutual inductances. Derive an expression for energy stored in the magnetic field.
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 wave equation for Electromagnetic wave using Maxwell's electromagnetic equations.
12. (a) Draw the circuit to draw input and output characteristics of a transistor in CE configuration.
(Or)
(b) Explain the operations of NPN and PNP transistors.
13. (a) What are universal logic gates? Explain their operation. Realize AND, OR and NOT gates from NAND/NOR logic.
(Or)
(b) Explain the operation of Half and Full adders.
