- #1
LCSphysicist
- 645
- 161
- Homework Statement
- The first telegraphic messages crossed the Atlantic in 1858, by a
cable 3000 km long laid between Newfoundland and Ireland. The
conductor in this cable consisted of seven copper wires, each of
diameter 0.73 mm, bundled together and surrounded by an insulating
sheath.
- Relevant Equations
- .
A return path for the current was provided by the ocean itself.
Given that the resistivity of seawater is about 0.25 ohm-meter,
see if you can show that the resistance of the ocean return
would have been much smaller than that of the cable. (Assume
that the electrodes immersed in the water were spheres with
radius, say, 10 cm.)
I will not post my attempt to solve it because, actually, i have no idea what the question is talking about.
What i am suppose to do with this spheres in the water?
Given that the resistivity of seawater is about 0.25 ohm-meter,
see if you can show that the resistance of the ocean return
would have been much smaller than that of the cable. (Assume
that the electrodes immersed in the water were spheres with
radius, say, 10 cm.)
I will not post my attempt to solve it because, actually, i have no idea what the question is talking about.
What i am suppose to do with this spheres in the water?