B.E-B.E Electronics and Instrumentation Engineering Field Theory(Sathyabama University, Chennai, Tamil Nadu-2010)
Friday, 23 August 2013 06:38Duraimani
(Established under section 3 of UGC Act,1956)
Course & Branch :B.E - EIE
Title of the Paper :Field Theory Max. Marks :80
Sub. Code :518505/6C0047 Time : 3 Hours
Date :21/04/2010 Session :AN
PART - A (10 x 2 = 20)
Answer ALL the Questions
1. Define the electric potential due to a point charge.
2. Find the force in Newton on charge Q1 = 20μC situated at (0,1,2)m due to charge Q2=-300μC situated at (2,0,0)m.
3. What is polarization of dielectrics?
4. Why is the electrostatic potential continuous at a boundary?
5. Define vector magnetic potential and state its units
6. What is the relation between magnetic flux density and magnetic field intensity?
7. Write Lorentz force equation. Give applications of the same.
8. Define self inductance and mutual inductance.
9. State Faraday’s Law.
10. Write down the expression for the emf induced in the moving loop in static B field.
PART – B (5 x 12 = 60)
Answer All the Questions
11. A circular disc of radius ‘a’ m is charged uniformly with a charge density of rs C/m2. Find the electric field at a point ‘h’ m from the disc along its axis.
(or)
12. Derive the expression for the potential at a point P, h meters above a circular disc charged to rs C/m2. Hence deduce the potential at the centre of the disc.
13. Find the total current in a circular conductor of radius 4mm if the current density varies according to J=(104/r) A/m2.
(or)
14. A cylindrical capacitor consists of an inner conductor of radius ‘a’ and an outer conductor whose inner radius is ‘b’. The space between the conductors is filled with a dielectric of permittivity e, and the length of the capacitor is L. Determine the capacitance of this capacitor.
15. What is Biot-Savart-law? Find the magnetic flux density at a point Zon the axis of a circular loop of radius a that carries a direct current I.
(or)
16. Find H at the centre of an equilateral triangular loop of side 4 m carrying a current of 5A.
17. Derive the expression for co-efficient of coupling in terms of mutual and self inductances.
(or)
18. Find H in a magnetic material.
(a) When m = 0.000018 H/m and M = 120 A/m.
(b) When B = 300 mT and magnetic susceptibility = 20.
19. Derive the Maxwell’s equations for fields varying harmonically with time.
(or)
20. Define Poynting vector and deduce the Poynting’s theorem neatly.
| Earning: ₹ 3.10/- |
