Duration: 3:53

0 views

0

Two different wires having lengths \( L_{1} \) and \( L_{2} \), and
P
respective temperature coefficient of linear expansion \( \alpha_{1} \) and \( \alpha_{2} \), are joined end-to-end. Then the effective
W
temperature coefficient of linear expansion is:
(1) \( \frac{\alpha_{1} L_{1}+\alpha_{2} L_{2}}{L_{1}+L_{2}} \)
(2) \( 2 \sqrt{\alpha_{1} \alpha_{2}} \)
(3) \( \frac{\alpha_{1}+\alpha_{2}}{2} \)
(4) \( 4 \frac{\alpha_{1} \alpha_{2}}{\alpha_{1}+\alpha_{2}} \frac{L_{2} L_{1}}{\left(L_{2}+L_{1}\right)^{2}} \)


📲PW App Link - https://bit.ly/YTAI_PWAP
🌐PW Website - https://www.pw.live