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Three rods of equal of length are joined...

Three rods of equal of length are joined to from an equilateral triangle ABC. `D` is the midpoint of AB. The coefficient of linear expansion is `alpha_(1)` for AB and `alpha_(2)` for `AC` and `BC` . If the distance `DC` remains constant for small changes in temperature,

A

`(alpha_(1) + alpha_(2))Ldeltat`

B

`(2alpha_(1) + alpha_(2))/(2)LDeltat`

C

`((alpha_(1) + 2alpha_(2))Ldeltat)/(2)`

D

Zero

Text Solution

Verified by Experts

The correct Answer is:
D
`Dc^(2) = l^(2) = l^(2)(1 + alpha_(2)t)^(2) - [(l)/(2)(1 + alpha_(1)t)]^(2)`
neglecting `alpha_(2)^(2)` & `alpha_(1)^(2)` & solving above we get `alpha_(1) = 4alpha_(2)`
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