Definition of unit of electric current

  • Thread starter Quantumkid
  • Start date
  • #1
The ampere is that constant current which , if maintained in two straight parallel
conductors of infinite length, of negligible
circular cross-section
, and placed 1 metre apart in vacuum, would produce between
these conductors a force equal to 2 × 10 ^{–7} newton per metre of length.

What is meant by orange colored text??
 

Answers and Replies

  • #2
mgb_phys
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Yes - and your question is ?
 
  • #3
DrDu
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It means that one considers the limit that the wires are infinitely thin.
 

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