Current flows through the block of metal

[court2011]

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

 

[tiny-tim]

Hi court2011!

Hint: resistivity ​

 

[court2011]

so it'll be I= pi a(b^2)/c?

 

[tiny-tim]

(have a pi: π and a rho: ρ and try using the X² tag just above the Reply box )

Sorry, not following you …

what is? and why? ​

 

[court2011]

would the equation be (3.14)(a)(b²)/c