Two straight metallic strips each of thickness \( t \) and length \( l \) are rivetted together....
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0Two straight metallic strips each of thickness \( t \) and length \( l \) are rivetted together. Their coefficients of linear expansions are \( \alpha_{1} \) and \( \alpha_{2} \). If they are heated through temperature \( \Delta T \), the bimetallic strip will bend to form an arc of radius :
(A) \( t /\left(\alpha_{1}+\alpha_{2}\right) \)
(B) \( t /\left(\alpha_{1}-\alpha_{2}\right) \Delta T \)
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(D) \( t\left(\alpha_{1}+\alpha_{2}\right) \Delta T \)
(D) \( t\left(\alpha_{1}-\alpha_{2}\right) \Delta T \)
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