A copper cylindrical tube has inner radius a and outer radius 
. The resistivity is 
. The resistance of the cylinder between the two ends is
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 
and 
are the currents flowing through the inner and outer cylinders.
where 
is the total resistance and 
is the resistance of the tubular part.
But, 
and 
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