(A) A square sheet of thickness t = 3.9 mm and length L = 100 mm is made of iron

Question

(A) A square sheet of thickness t = 3.9 mm and length L = 100 mm is made of iron with resistivity ? = 100 n?

A square sheet of thickness t = 3.9 mm and length L = 100 mm is made of iron with resistivity ? = 100 n?·m (nano ohm meter) and is at room temperature (20 degree C). What is the resistance (in units of ??) between the two opposite faces (hatched area)? The resistance between the two opposite faces that we calculated above is directly proportional to t directly proportional to L independent of L independent of t

Explanation / Answer

A)

R= rho*l/A = 100*10^(-9)*100*10^(-3)/(3.9*10^(-3)*.1)=0.00002564102 ohms =25.641 u ohms

B)

R=rhol*/A=rho*(L)/(tL)=rho/t so it is

C- independent of L

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