Two rods of lengths L1 and L2 are welded together to make a composite rod of length (L_1+L_2). If the coefficients of linear expansion of the rods are \alpha_1 and \alpha_2 respectively, the effective coefficient of linear expansion of the composite rod will be

Correct Answer is : L1α1+L2α2L1+L2

\frac{L_1\alpha_1+L_2\alpha_2}{L_1+L_2}

\frac{L_1L_2+\alpha_1\alpha_2}{L_1+L_2}

NEET Exam Model Paper 13

Question : 66 of 180

Marks: +1, -0

Two rods of lengths L1 and L2 are welded together to make a composite rod of length (L_1+L_2). If the coefficients of linear expansion of the rods are α1 and α2 respectively, the effective coefficient of linear expansion of the composite rod will be

√α1α2
2
3
(α1+α2)
L1α1+L2α2
L1+L2
L1L2+α1α2
L1+L2

Validate

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