Ohm's Law Problem

  • Thread starter VitaX
  • Start date
  • #1
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Homework Statement



2iudsgm.png


Homework Equations



R = (Rou*A)/L
V = R/i

The Attempt at a Solution


In this one I don't really understand how my answer to part a is wrong.
My Work: L = 5.9 cm = 5.9E-2 m
diameter = 8.4 mm = 8.4E-3 m ... radius = 4.2E-3 m ... A = pi*r^2 = pi(4.2E-3)^2 = 5.541769E-5 m^2
R = (Rou*A)/L = (1.69E-8 * 5.541769E-5)/(5.9E-2) = 1.5873882E-11 Ohms
V = R/i = (1.5873882E-11)/(33) = 4.81026727E-13 V = 4.81026727E-10 mV
 

Answers and Replies

  • #2
gneill
Mentor
20,925
2,867
Your resistance calculation is in error. Check your formula.
 

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