# Determine the resistance of metal tube in term of the external diameter D, the internal diameter d , the length l and the resistivity. Calculate the resistance of a copper tube 0.5cm thick and 2m long. The external diameter is 10cm

Determine the resistance of metal tube in term of the external diameter D, the internal diameter d , the length l and the resistivity. Calculate the resistance of a copper tube 0.5cm thick and 2m long. The external diameter is 10cm
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Given:
The external diameter of tube D = 10 cm. = 0.1 m.
The thickness of the tube t = 0.5 cm = 0.005 m.
The length of the tube l = 2 m.
The resistivity of copper
The cross section area of tube will be,

The resistance of the metal tube will be,
$R=\rho \frac{l}{A}\phantom{\rule{0ex}{0ex}}R=1.68×20.05977\phantom{\rule{0ex}{0ex}}R=56.215\mathrm{\Omega }$
The resistance of the tube is $=56.215\mathrm{\Omega }$