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Q.

The dimensions of four wires of the same material are given below. In which wire the increase in length will be maximum for the same applied force?

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a

l = 100 cm and diameter 1 mm

b

l = 200 cm and diameter 2 mm

c

l = 300 cm and diameter 3 mm

d

l = 50 cm and diameter 0.5 mm

answer is D.

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Detailed Solution

eαlr2 e1 α100122∝400e2 α20012∝200e3 α3001.52∝133.3e4 α500.252∝800
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