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Two rods of identical dimensions with Yo...

Two rods of identical dimensions with Young's modulus `Y_1` and `Y_2` are joined end to end. The equivalent Young's modulus for the composite rod is

A

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

B

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

C

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

D

(D) `Y_1+Y_2`

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The correct Answer is:
A
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