1.

Length of a hollow tube is 5m, it?s outer diameter is 10 cm and thickness of it?s wall is 5 mm. If resistivity of the material of the tube is 1.7 ´ 10?8 W´m then resistance of tube will be

A.            5.6 ´ 10?5 W                          
B.            2 ´ 10?5 W
C.            4 ´ 10?5 W                              
D.            None of these
Answer» B.            2 ´ 10?5 W


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