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An aluminium (resistivity $\rho=2.2 \times 10^{-8} \Omega m)$ wire of a diameter $1.4 \;mm$ is used to make a $4 \Omega$ resistor. The length of the wire is

\[\begin {array} {1 1} (a)\;220\;m & \quad (b)\;1000\;m \\ (c)\;280\;m & \quad (d)\;1\;m \end {array}\]

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(d) 1 m
answered Nov 7, 2013 by pady_1

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