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Q.

A wire is loaded by 6 kg at its one end, the increase in length is 12 mm. If the radius of the wire is doubled and all other magnitudes are unchanged, then increase in length will be

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a

6 mm

b

3 mm

c

24 mm

d

48 mm

answer is B.

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Detailed Solution

l∝1r2 . If radius of the wire is doubled then increment in length will become  14 times i.e.  124=3mm
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