Two rods of equal length and cross- sect...

Two rods of equal length and cross- sectional area have their Young's moduli `Y_1` and `Y_2` respectively. IF the rods are joined end to end, then the equivalent Young's modulus of the combined rod system is

`(2Y_1Y_2)/(Y_1+Y_2)`

`(Y_1Y_2)/(Y_1+Y_2)`

`1/(2(Y_1+Y_2))`

`Y_1+Y_2`

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