A copper transmission cable 140 km long and 11.0 cm in diameter carries a current of 150 A . The resistivity of cooper is 1.72 × 10−8 Ω⋅m. Part A What is the potential drop across the cable?

The potential drop across the cable is 38 volts.

Explanation:

Given that,

Length of the copper cable, l = 140 km

Diameter of the cable, d = 11 cm

Radius, r = 5.5 cm

We need to find the potential drop across the cable. It can be calculated using Ohm's law. It is given by :

R is the resistance

We know that the resistance is given by :

Voltage becomes :

So, the potential drop across the cable is 38 volts. Hence, this is the required solution.

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