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Heat and Thermodynamics question

2020 · 5 Sep · Shift 2 · Q48
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  5. /2020 · 5 Sep · Shift 2 · Q48

Heat and Thermodynamics question

2020 · 5 Sep · Shift 2 · Q48

JEE MainPhysicsHeat and ThermodynamicsMCQ+4 / −1
Two different wires having lengths L1 and L2, and respective temperature coefficient of linear expansion α\alphaα 1 and α\alphaα 2, are joined end-to-end. Then the effective temperature coefficient of linear expansion is :
  1. A
    2α1α22\sqrt {{\alpha _1}{\alpha _2}}2α1​α2​​
  2. B
    4α1α2α1+α2L2L1(L2+L1)24{{{\alpha _1}{\alpha _2}} \over {{\alpha _1} + {\alpha _2}}}{{{L_2}{L_1}} \over {{{\left( {{L_2} + {L_1}} \right)}^2}}}4α1​+α2​α1​α2​​(L2​+L1​)2L2​L1​​
  3. C
    α1+α22{{{\alpha _1} + {\alpha _2}} \over 2}2α1​+α2​​
  4. D
    α1L1+α2L2L1+L2{{{\alpha _1}{L_1} + {\alpha _2}{L_2}} \over {{L_1} + {L_2}}}L1​+L2​α1​L1​+α2​L2​​
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