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Q.

The radius of a wire is decreased to one-third. If volume remains the same, length will increase by

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a

3 times

b

9 times

c

6 times

d

1.5 times

answer is D.

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Detailed Solution

According to question,

πr2h=π×13r2×H=πr2H9⇒H=9 h

So, length will increased by 9 times.

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