Question

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

• A. $1.5\Omega$
• B. $3\Omega$
• C. $6\Omega$
• D. $12\Omega$

Answer 1

Answer: (D)

$R_2=n^2{R}_1$
$R_2=2^2\times 3$
$R_2=12\Omega$