Tuesday 15 January 2013

EMTL bits



                                                       JNTUH first mid bits

                                                               EMTL

                                              Unit-I: Electrostatics-I

Section-I:               Multiple choice questions

 1. The divergence theorem [   ]
a) Relates a line integral to a surface integral. b) holds for specific vector fields only.
c) Works for open surfaces. d) Relates a surface integral to a volume integral.

2.  which one of the following is not Maxwell equation?  [  ]



3. Which of the following is zero?   [  ]

 a)grad div b)curl grad c)div grad d)curl curl

4.  The field intensity due to a point charge Q at a distance, R, is E1. If charge is increased to ‘4Q’ and distance is increased to ‘2R’, the field intensity E2 becomes [ ]

(a)   E2 = E1 (b) E2 = 4E1 (c) E2 = 2E1 (d) E2 = E1/2

5.  Electrostatic field being conservative doe s not mean [      

(a) Its circulation is identically zero (b) the work done in side a closed path inside the field is zero
(c) The potential difference between any two point s is zero (d) it is the gradient of a scalar potential

6.  A charge Q is uniformly distributed in a sphere of radius a1 the charge density, if the same charge Q is made to occupy a sphere of radius a2=a1/4 is [      

(a) 16 times more (b) 4 times more (c) 64 times more (d) 2 times more

7. The Electric Field inside a uniformly charged spherical shell is [ ]
( a ) unity ( b ) zero ( c ) infinite ( d ) undefined

8.  Gaussian surface encloses a collection of negative charges, then for such a surface, the normal component of Electric Flux Density will become [ ]
( a ) zero ( b ) point outwards ( c ) point inwards ( d ) infinity

9.
 



Section-II:   Fill in the blanks

10. If the electric flux density, D and electric field intensity, E are not in the same direction, the material is called as ____________

11. Value of permeability of free space is ___________

12. According to _________,electrical flux due to any closed surface is equal to the charge enclosed by the surface.

13. Point charges 30 nC , - 20nC and 10 nC are located at (-1,0, 2) , (0,0, 0) and (1,5,-1) respectively. The total flux leaving a cube of side 6m centered at the origin is ________.

14. The Electric Flux Density is __________ to the electric flux lines

15. The curl of a gradient is _________



                                                                                 Prepared by
                                                                                   Mukesh