Current flows through the block of metal

AI Thread Summary
The discussion revolves around calculating the current flowing through a rectangular block of metal when a potential difference is applied between different faces. When a potential difference V is applied between the A-B faces, a current IAB is observed. Participants are trying to express the current flowing when the same potential difference V is applied between the B-C faces in terms of IAB. The conversation includes hints about using resistivity and relevant equations, but there is some confusion regarding the correct formulation. The key focus is on deriving the relationship between the currents based on the geometry of the block and resistive properties.
court2011
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Homework Statement



Consider a rectangular block of metal of height A, width B, and length C, as shown in the figure below. If a potential difference V is maintained between the two A B faces of the block, a current IAB is observed to flow. Find the current that flows if the same potential difference V is applied between the two B C faces of the block. Give your answer in terms of IAB. (Use Iab for IAB, and A, B, and C, as necessary.)

http://www.webassign.net/walker/21-27.gif

Homework Equations





The Attempt at a Solution



I= Iab/Ibc

 
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Hi court2011! :smile:

Hint: resistivity :wink:​
 


so it'll be I= pi a(b^2)/c?
 
(have a pi: π and a rho: ρ and try using the X2 tag just above the Reply box :smile:)

Sorry, not following you :redface: …

what is? and why? :confused:​
 


would the equation be (3.14)(a)(b2)/c
 

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