A copper cylindrical tube has inner radius a and outer radius b. The resistivity is ρ. The resistance of the cylinder between the two ends is:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
If one had considered a solid cylinder of radius b, one can suppose that it is made of two concentric cylinders of radius a and the outer part, joined along the length concentrically one inside the other.
If I a and I x are the currents flowing through the inner and outer cylinders
Where R b is the total resistance and R x is the resistance of the tubular part.
But 
and 
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