Two straight metallic strips each of thickness $t$ and length $\ell$ 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
Two straight metallic strips each of thickness $t$ and length $\ell$ 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
$\left.t /\left\{\alpha_1+\alpha_2\right) \Delta T \right\}$
- B
$t /\left\{\left(\alpha_2-\alpha_1\right) \Delta T\right\}$
- C
$t\left(\alpha_1-\alpha_2\right) \Delta T$
- D
$t\left(\alpha_2-\alpha_1\right) \Delta T$
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