A cylindrical cable with 1.85 x 10-8 m resistivity carries a current of 1100 A. There is a potential difference of 1.5 x 10-3 V between two points on the cable that are 0.23 m apart. What is the radius of the cable?

The radius is 0.03 meters

Explanation:

Assuming cable as ohmic material, it satisfies Ohm's law:

With R the resistance, V the voltage and I the current. So, the resistance between the points indicated in the problem is:

Ω

Now with this value we can use the fact that resistance is:

with ρ the resistivity, L the length and A the cross area of the cylinder, so:

Solving for r:

the assestment will probley apele with cause and effect