A) 6 mm
B) 3 mm
C) 24 mm
D) 48 mm
Correct Answer: B
Solution :
\[l\propto \frac{1}{{{r}^{2}}}\]. If radius of the wire is doubled then increment in length will become \[\frac{1}{4}\] times i.e. \[\frac{12}{4}=3mm\]
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