31. MUF is depend upon
32. The radiation pattern of loop antenna is
33. When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon
34. If a and b are the dimensions of waveguide then
35. When a wave is incident from the more dense into a less dense medium at an angle equal to or exceeding the critical angle, the wave suffers total internal __________ .
36. Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike?
37. The useful magnetic flux obtainable from any closed surface is
38. When the phase velocity of an EM wave depends on frequency in any medium the phenomenon is called
39. A satellite that simply reflect back the signals from one region of the earth to the other region is known as
40. The main disadvantage of the two-hole directional coupler is
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