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Physics-

General

Easy

Question

Bars of two different metals are bolted together, as shown in figure. The distance x does not change with temperature if:–

$\frac{l_{A}}{l_{B}} = \frac{α_{A}}{α_{B}}$
$\frac{l_{A}}{l_{B}} = \frac{α_{B}}{α_{A}}$
$\frac{l_{A}^{2}}{l_{B}^{2}} = \frac{α_{A}}{α_{B}}$
$\frac{l_{A}^{2}}{l_{B}^{2}} = \frac{α_{B}}{α_{A}}$

The correct answer is: $fraction numerator l subscript A end subscript over denominator l subscript B end subscript end fraction equals fraction numerator alpha subscript B end subscript over denominator alpha subscript A end subscript end fraction$

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