The resistance of a wire is 20 ohms. It is so stretched that the length becomes three times, then the new resistance of the wire will be

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6.67 ohms

60.0 ohms

120 ohms

180.0 ohms

answer is D.

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Detailed Solution

In case of stretching of wire $R \propto l^{2}$
$\Rightarrow$ If length becomes 3 times, resistance becomes 9 times
$i . e ., R^{'} = 9 \times 20 = 180 Ω$

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