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

- 2
- 4
- 4/3
- 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.**