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 answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

3. dark matter

empty space could also be a simple vacuum