Question

The capacitance of a complete loop of a transmission line decreases if the distance between conductors

Answer 1

capacitance of capacitor is given by $C=\frac{\epsilon_0A}{d}$
where C is capacitance of capacitor, A is cross section area of conducting plate and d is the distance between conducting plates . 

here we can see that capacitance is inversely proportional to distance between conducting plates. means, capacitance decreases when distance between conducting plates increases.

hence, the capacitance of a complete loop of a transmission line decreases if the distance between conductors increases.

Answer 2

Formula for capacitance given as

$C =  \frac{A\alpha}{d}$

where $\alpha$ is permittivity

and A is the cross sectional area

and d is the distance between conducting plates.

hence capacitance inversely proportional to distance

so it will decrease by increasing distance.

So,The capacitance of a complete loop of a transmission line decreases if the distance between conductors increases.