If power is transmitted in DC 2-wire system, the volume of the two conductors used will be

1. directly proportional to the square of the length of the conductor
2. inversely proportional to the square of the voltage
3. directly proportional to the power transmitted
4. all of these

Answer:  2. inversely proportional to the square of the voltage.

Explanation:

K=4P2ρl2WV2m⋅⋅⋅(1)

Where K is the Volume of conductors. 

It is proved that the volume of the conductor s inversely proportional to the square of the voltage, which1 means if we increase the level of voltage for transmission and distribution purposes, then the volume of the conductor (size of the conductor) will reduce twice which is a more effective approach to reduce the system cost.