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An iron wire is suspended vertically fro...

An iron wire is suspended vertically from a rigid support. when loaded with a weight in air, it extends by `l_a` and when the weight is immersed completely in water, the extension is reduced to `l_a / 3`. then the relative density of the material of the weight is
a) `3` b) `3/2` c) `2/3` d) `1/3`

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