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Electric Field distribution around two-conductor cable

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AndreyG

Electrical
Nov 24, 2010
29
What is electric field distribution around two conductor cable connected to DC power supply? Assume power supply is isolated and not grounded. Assume cable is straight.
Case 1: no current runs through the cable. One wire is positive, another – negative. Negative or zero? If we think in terms of charge: Positive wire has positive charge in it, electric field distribution is radially outwards. What charge is in negative wire? This will determine total field distribution. If there is no charge in negative wire total field distribution will be that from positive wire only - radially outward. If there are negative charges in negative wire the total distribution form the cable will be like from dipole – on positive wire side field will be outwards, on negative wire side field will be inwards. What field distribution is correct?

Case 2: load is attached to cable and current flows. Will the Electric field distribution change?

 
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How well do you know Maxwell's Equations? If you can figure them out, they can answer your question!
 
IS this for school? Student posting is not allowed. Your question is partly answered in your given assumption, i.e., the power supply is NOT grounded.

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