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Two straight metallic strips each of thickness t and length L are riveted together. Their coefficients of linear expansions are $α_{1}$ and $α_{2}$ . If they are heated through temperature $∆ θ$ , the bimetallic strip will bend to form an arc of radius

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$t / [(α_{1} + α_{2}) Δ T]$

$t / [(α_{2} - α_{1}) Δ T]$

$t [(α_{1} + α_{2}) Δ T]$

$t [(α_{2} - α_{1}) Δ T]$

answer is B.

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