INTERNAL 1 QUESTION FOR ELECTROMAGNETIC FIELDS (EMF)

SRI SUBRAMANYA COLLEGE OF ENGINEERING AND TECHNOLOGY

Internal Test –I (2014-15)

              Department of Electronics and Communication Engineering 

Date                     : 12.02.2015                                                     Duration: 1 hr 30 min

Subject     : EC 6403- Electromagnetic fields        Name of the Staff: S.N. Lalitha Parameswari

Year/Sem : II / IV                                                 Marks: 50 marks

               

Part - A                                   Answer all the question                                               (7*2=14)

1. State Biot-Savart’law?

2. State Ampere’s law?

3. What do you mean by magnetic moment?

4. Define Magnetic field intensity and magnetic flux density?

5. Define Magnetic vector potential?

6. Determine the gradient of the scalar field F=5r²+rsinӨ.

7. Calculate the divergence of the field at (1, 2, 3) for D=4xya_x+3xyza_y+2xya_z.

Part –B                                               Compulsory Question                                                 (1*4=4)

8. State and prove Ampere’s circuital law?

Part – C                                              Answer any 2Questions                                  (2*16=32)

9.    (i) Obtain the scalar and vector magnetic potential?                                     (6)       

      (ii) Discuss in detail the applications of Ampere’s circuital law?                   (10)

10. (i) Derive the expression for Curl H=J?                                                          (4)

(ii) Derive the expression for magnetic field intensity H on the axis of a

       Circular loop of radius’a’ carrying the current I?                                     (12)

11. Derive the magnetic field intensity and magnetic flux density at a point due to an                         

              (i) Finite line (8)           and          (ii) infinite line (8)

*** All the Best ***