JNTUH first mid
bits
EMTL
Unit-I:
Electrostatics-I
Section-I: Multiple
choice questions
1. The divergence theorem
[d ]
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? [ d ]
3. Which of the following is zero? [ c]
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 ]
(a) E2
= E1 (b) E2 = 4E1 (c) E2 = 2E1 (d) E2 = E1/2
5. Electrostatic
field being conservative doe s not mean [
c ]
(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 [ c ]
(a) 16 times more (b) 4 times more (c) 64 times more (d)
2 times more
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 Anisotropic medium
11. Value of permeability of free space is 4π ×10^-7 H/ m.
12. According to Gauss’s law 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 10NC..
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