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Transcript

LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034 B.Sc. DEGREE EXAMINATION – PHYSICS FOURTH SEMESTER – APRIL 2008 PH 4500 - ELECTRICITY & MAGNETISM Date : 26/04/2008 Time : 9:00 - 12:00 Dept. No. PART A ANSWER ALL THE QUESTIONS FG 45 Max. : 100 Marks (10 x 2m = 20 m) 1) State Gauss’s theorem of electrostatics. 2) Three parallel plate capacitors with capacitance values 1 μF, 2 μF and 3 μF are connected in series. Find the effective capacitance value. 3) What is Seebeck effect? 4) Write down the chemical reactions taking place at the plates of a Daniel cell. 5) What is a Helmholtz galvanometer? 6) Define mutual inductance of a coil. 7) Represent graphically the growth and decay of a current in an inductance coil when connected across a dc supply. 8) Explain the term ‘power factor’ of an ac circuit. 9) What is magnetic susceptibility and how is it related to magnetic permeability? 10) Give the expression for the Poynting vector. What does it signify? PART B ANSWER ANY FOUR QUESTIONS (4 x 7 ½ m= 30 m) 11) Obtain an expression for the loss of energy in sharing of charges between two capacitors. 12) Explain the theory of determining the resistance of a coil using Carey Foster’s bridge. 13) Derive an expression for the magnetic field on the axis of a current carrying narrow circular coil. 14) Obtain an expression for the growth of charge in a capacitor when connected across a dc supply and a resistor. 15) Explain the domain theory of ferromagnetism. PART C ANSWER ANY FOUR QUESTIONS (4 x 12 ½ m = 50 m) 16) Obtain expressions for potential and intensity of electric field due to an electric dipole. 17) Apply thermodynamics to a thermocouple to obtain expressions for Peltier and Thomson emfs. 18) Discuss the theory of moving coil galvanometer to find expression for the deflection in terms of current. 19) Discuss the mathematical theory of a LCR series ac circuit and obtain the condition for resonance. 20) Write down the Maxwell’s equations in source free region and prove that electromagnetic wave travel in free space with the speed of light. ********** 1