Current required in a long wire

  • Thread starter rwilson5
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Homework Statement



Determine the amplitude of a magnetic field in an electromagnetic wave that carries a flux density of 100 mW/cm2. How much current would be required in a long straight wire so that the magnetic field if this same amplitude would be generated at a distance of 1mm from the wire.

Homework Equations



$$B_0=\frac{E_0}{c}=\frac{1}{c}\sqrt{\frac{2I}{c\epsilon_0}}$$


The Attempt at a Solution



I'm not sure how to get at this one. I got that $$B_0=2.89 \cdot 10^{-6} T.$$ Just a touch in the right direction would be awesome.
 

Answers and Replies

  • #2
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The approach looks fine, and a computer can check the numerical value. Where is the problem?
 

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