A wire of length L is hanging from a fixed support. The length changes to L 1 and L 2 when masses 1 kg and 2 kg are suspended respectively from its free end. Then the value of L is equal to

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From Hooke's law, ∆ L = F L A Y ⇒ ∆ L ∝ F . Therefore, L 2 - L L 1 - L = m 2 g m 1 g = 2 1 ⇒ L = 2 L 1 - L 2

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