1.

In an electrical cable there is a single wire of radius 9 mm of copper. Its resistance is \[5\,\Omega \]. The cable is replaced by 6 different insulated copper wires, the radius of each wire is \[3\,mm\]. Now the total resistance of the cable will be [CPMT 1988]

A.            \[7.5\,\Omega \]                
B.            \[45\,\Omega \]
C.            \[90\,\Omega \]                 
D.            \[270\,\Omega \]
Answer» B.            \[45\,\Omega \]


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