Spaced Air
December 16th, 2009 | 
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34. The velocity factor for small widely spaced conductors such as open wire line in air is very nearly?
34. The velocity factor for small widely spaced conductors such as open wire line in air is very nearly
(a) 0.66 (b) 0.98
(c) 0.82 (d) 0.76
Velocity factor is the ratio of the velocity of wave propagation to the velocity of light in a vacuum.
Velocity Factor = v / c
For electromagnetic wave propagation it represents the relative permittivity of the dielectric between the conductors.
Velocity Factor = 1 / √ k
In this case it is air, which has a relative static permittivity of 1.00058986 ± 0.00000050 (at STP, for 0.9 MHz)
(b) 0.98 is the closest answer.
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