A) 88 cm
B) 68 cm
C) 6.8 cm
D) 113.9 cm
Correct Answer: B
Solution :
\[\Delta {{\ell }_{1}}=\Delta {{\ell }_{2}}\] \[{{\ell }_{1}}{{\alpha }_{1}}={{\ell }_{2}}{{\alpha }_{2}}\] \[\frac{{{\ell }_{1}}}{{{\ell }_{2}}}=\frac{{{\alpha }_{2}}}{{{\alpha }_{1}}}\] \[\frac{88}{{{\ell }_{a}}}=\frac{2.2\times {{10}^{-5}}}{1.7\times {{10}^{-5}}}\] \[{{\ell }_{a}}=68cm\] Comment: In this question it should be difference in length instead of increase in length.
You need to login to perform this action.
You will be redirected in
3 sec
