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The precaution to be taken during determination of young's modulus using Searl's apparatus 1) Micrometer screw should be rotated in same direction while taking reading. 2) Reading should be taken immediately after loading or unloading to the experimental wire 3) The load added should be with in elastic limit.

$(a)\;\text{1 and 2 are correct} \\(b)\;\text{1 and 3 are correct} \\(c)\;\text{2 and 3 are correct} \\(d)\;\text{Only 2 is correct } $
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Both 1 and 3 are correct.
We should wait for a few seconds for the elongation of the wire to be completed before taking the reading.
Hence c is the correct answer.
answered Mar 19, 2014 by meena.p

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