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# In Searle's experiment to determine the young's modulus of a wire. The diameter of the given wire is measured by using

$(a)\;\text { the micrometer screw after air bubble in the spirit level is brought to the centre.} \\(b)\; \text { the micrometer screw after loads are added to the weight hanger}\\(c)\;\text{using the screw gavge} \\(d)\;\text { using the vernier calliper provided .}$

Diameter of wire is measured at different places of the wire using screw gauge.
Hence c is the correct answer.