An insulator used in a transmission line has dielectric constant

• Communication Systems

An insulator used in a transmission line has dielectric constant equal to 0.25. What is the velocity factor of the transmission line?

1. 2
2. 4
3. 4/3
4. 3/4

Answer

VF (velocity factor) equals the reciprocal of the square root of the dielectric constant.

VF = 1/√k

= 1/√.25

= √(100/25)

= √4

= 2

The correct option is A.