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  4. A wire of resistance 3 Ω is stretched to twice its original length. The resistance of the new wire will be

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Q. A wire of resistance $3 \,\Omega$ is stretched to twice its original length. The resistance of the new wire will be

KCETKCET 2021Current Electricity

Solution:

$R _{2}= n ^{2} R _{1}$
$R _{2}=2^{2} \times 3$
$R _{2}=12 \,\Omega$