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  1. The radius of a wire is decreased to one-third. If volume remains the same, length will increase by
    1. 1.5 times
    2. 3 times
    3. 6 times
    4. 9 times
Correct Option: D

Volume of wire (V1) = πr&sub2;h
Case II,

Volume of wire (V1) = π
r
h1
3

∵ V1 = V1
∴ πr²h =
πr²h1
⇒ h1 = 9h
9


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