A tapering bar (diameters of end sections being \[{{d}_{1}}\] and\[{{d}_{2}}\]) and a bar of uniform cross-section ?d? have the same length and are subjected to the same axial pull. Both the bars will have the same extension if ?d' is equal to:

\[\sqrt{\frac{{{d}_{1}}{{d}_{2}}}{2}}\]

\[\frac{{{d}_{2}}+{{d}_{2}}}{2}\]

\[\sqrt{\frac{{{d}_{1}}+{{d}_{2}}}{2}}\]

A tapering bar (diameters of end sections being \[{{d}_{1}}\] and\[{{d

1.	A tapering bar (diameters of end sections being \[{{d}_{1}}\] and\[{{d}_{2}}\]) and a bar of uniform cross-section ?d? have the same length and are subjected to the same axial pull. Both the bars will have the same extension if ?d' is equal to:
A.	\[\frac{{{d}_{2}}+{{d}_{2}}}{2}\]
B.	\[\sqrt{{{d}_{1}}{{d}_{2}}}\]
C.	\[\sqrt{\frac{{{d}_{1}}{{d}_{2}}}{2}}\]
D.	\[\sqrt{\frac{{{d}_{1}}+{{d}_{2}}}{2}}\]
Answer» C. \[\sqrt{\frac{{{d}_{1}}{{d}_{2}}}{2}}\]

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A tapering bar (diameters of end sections being \[{{d}_{1}}\] and\[{{d}_{2}}\]) and a bar of uniform cross-section ?d? have the same length and are subjected to the same axial pull. Both the bars will have the same extension if ?d' is equal to:

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