Question

The affect of the earth plane is to slightly increase the capacitance, and as the line height increases, the effect of earth becomes negligible.

(a) True

(b) False

Short answer

Therefore, the correct answer is (a) True.

Step-by-step solution

Define purpose of transmission line heights

Transmission-line heights are usually designed in order to maintain the specific discharge currents as the discharge currents depends upon the line height.

Moreover, line height is selected in order to ensure the specified conductor-to-ground clearances and to control ground-level electric field and its potential shock hazard.

Explain effect of Earth

The capacitance runs in parallel proportion with the Earth or ground as it is considered as sink to charges.

If the wire line is kept at larger height from the ground, then the wire is at around 5 to 6 m above the ground.

Then, the capacitance of the wire line has negligible effect of the ground and it increases capacitance of the wire line as charges are protected from the ground to get sink.

Hence, the given statement is true. Thus correct option is (a).