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A wire of length L and of cross sectional area A is fixed between rigid supported of negligible tension . If cooled the tension in the wire.

$(a)\;\text{will reduce}\\(b)\;\text{ will increase}\\(c)\;\text{will remain same}\\(d)\;\text{May or may not vary}$
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On cooling the length of the wire will decrease and so tension will increase.
Hence b is the correct answer.
answered Mar 18, 2014 by meena.p

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