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image ELECTRIC field due to a solenoid, or a current-carrying wire, or... Share It Thread Tools Search this Thread image
Old Nov14-09, 03:03 PM                  #1
AxiomOfChoice

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ELECTRIC field due to a solenoid, or a current-carrying wire, or...

We always talk about the magnetic field produced by solenoids, straight wires of current, and rings of current, etc., but why do we never talk about the ELECTRIC fields produced by these geometries? I mean, there are CHARGES, right? So there must be electric fields present, right? Or am I wrong?

I know a CHANGING magnetic field produces an electric field, but why don't STEADY currents produce electric fields?
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Old Nov14-09, 05:38 PM                  #2
DaleSpam

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Re: ELECTRIC field due to a solenoid, or a current-carrying wire, or...

This just follows directly from Maxwell's equations. With no changing B field the E field has no curl (Faraday's law), and with no net charge the E field has no divergence (Gauss' law). A field with no curl and no divergence is identically 0.
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Old Nov14-09, 05:40 PM                  #3
jtbell

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Re: ELECTRIC field due to a solenoid, or a current-carrying wire, or...

Current-carrying wires contain equal amounts of positive and negative charge, and are electrically neutral.
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