physics paper iii

8/7/2019 Physics Paper III

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PHYSICS

Time :3 Hours III- B.Sc., Paper – III Max Marks : 100ELECRICITY - MAGNETISM - ELECTRONICS

PART – A 4x15= 60

Answer all Questions.

1. (a) State and prove Gauss law in electrostatics ?

(b) Derive an expression for the electric field at a point inside the uniformly

charged solid sphere?[OR]

(c) Define D, E and P ?

(d) Obtain the relation between D, E and P ? Hence deduce the relation betweendielectric constant and susceptibility.

2. (a) Explain the principle and working of cyclotron.

[OR]

(b) Explain the Construction and theory of Ballistic galvanometer ?

3. (a) State the basic laws of electricity and magnetism. From these laws deriveMaxwell’s equations in the differential form?

[OR]

(b) Derive equations for the growth and decay of charge in a circuit containingcapacitor, Resistance and a constant emf. What in meant by the time constant.

4. (a) Explain the half wave Rectifier? Derive expressions for rms value of current,efficiency and ripple factor?

[OR]

(b) Draw the circuit diagram of Half-adder and Full-adder, and explain itsoperation. Give its truth table?

PART – B 4x5= 20



Answer any four of the following.

5. Derive expression for the energy stored in a charged condenser?

6. Obtain the expression for the potential due to a point charge?

7. What is HALL effect? Explain its importance?

8. Explain the equivalence between magnetic shell and a current circuit?

9. Obtain expression for the energy stored in a solenoid?

10. Explain power factor in a LCR Series circuit?

11. Define NAND gate and write its truth table?

12. What is Displacement current. Derive expression for it?PART – C 4x5=20

Answer any four of the following.

13. A Spherical conductor has a capacity of 1 farad. Calculate its radius?

14. Two concentric spheres of radii 9cm and 10cm have air between them. Find thecapacitance of the spherical capacitor?

15. In a cyclotron, the frequency applied to the Dees is 8.6mega cycle/sec. calculatethe magnetic field of induction required to accelerate the proton? (m p=1.79 x 10 -

27Kg ; q p = 1.6 x 10 -19 coulomb).

16. What is the magnetic energy stored in a uniform magnetic field of induction 1 wb/ m2 in a volume of 10 -3 m3 ?

17. A coil of resistance 60 Ω and induction 3 henry in connected in series with a condenserof 4 µf and an AC supply of 200V at 50cps. Calculate the impedance of circuit?

18. A long conductor carries a current of 100mA. Find the magnetic field at a point10cm away from it?

19. Find the binary equivalent of 576 and Hexadecimal equivalent of 2047?

20. Find the electric potential on the surface of sphere of radius 5x10 -15m, Which ishaving 50 electrons at its centre?

Y



MVS GOVT. ARTS & SCIENCE COLLEGEDISTRICT RESOURCE CENTRE

MAHBUBNAGAR

PRE-FINAL EXAMINATIONS - JAN / FEB -2011PHYSICS

Time :3 Hours III- B.Sc., Paper – III Max Marks : 100ELECRICITY - MAGNETISM - ELECTRONICS

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physics paper iii

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