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Homework Help: Resistivity question.

  1. Nov 3, 2013 #1
    1. The problem statement, all variables and given/known data
    Determine the length of the shunt if the c.s.a of the copper is 25cm^2.

    2. Relevant equations
    R = ρ l/a
    Resistance of shunt is 0.5μΩ

    3. The attempt at a solution Transposing to find l.
    l = AR/ρ
    =25^2x10^2 x 0.5x10-6/1.7x10-8
    =7.4mm is the length of the shunt. Does this look feasible? Any guidance will be well received.
  2. jcsd
  3. Nov 3, 2013 #2


    User Avatar
    2017 Award

    Staff: Mentor

    Please use units, this makes it much easier to check which number you put where.
    I think there is a factor of 10 missing somewhere.
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