43.  Velocity of plane electromagnetic waves in vacuum equals
A. IF1`1470?E-:
B. IF1`1470?E-:
C. IF1`1470?E-:
D. IF1`1470?E-:

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44. For normal incidence, the angle of incidence is
A. 0?
B. 45?
C. 90?
D. 135?

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45. According to Snell's law, for electromagnetic waves cos0, cos?,sinO,
A. OFT0
B.0Co1
C.11.nn2
D.11.nn2

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46.  Plasma signifies
A. solid dielectric
B. Electronic medium
C. gaseous medium
D. liquid medium

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47. Polarization of an EM wave is taken as
A. direction of the magnetic field the
B. direction of the electric field
C. normal to the direction of magnetic field
D. normal to the direction of the electric

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48. The EM field and current are field concentrated close to the surface of the conductor. The phenomenon is called
A. Faraday's effect
B. Skin effect
C. EM concentration effect
D. Ohm's effect

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49. When EM waves are propagated in a rectangular waveguide
A. they travel along the broader walls of the waveguide
B. they travel through the dielectric without touching the walls
C. they travel along all the four walls of the waveguide
D. they are reflected from the walls but do not travel along the walls.

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