A) = 200 cm, d = 0.5 mm
B) L = 300 cm, d = 1.0 mm
C) L = 50 cm, d = 0.05 mm
D) L = 100 cm, d = 0.2mm
Correct Answer: C
Solution :
We know \[\Delta l=\frac{F\times l}{A\times Y}\] \[=\frac{4L}{\pi {{d}^{2}}}\] Here \[\frac{4}{\pi }\]is a constant Hence, \[\Delta l\propto \frac{L}{{{d}^{2}}}\]
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