The rectangular beam 'A ' has length l, width b and depth d. Another beam 'B' has the same width and depth but length is double that of 'A'. The elastic strength of beam 'B' will be __________ as compared to beam A.
A. Same
B. One-half
C. One-fourth
D. One-eighth
Answer: Option B
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Z= I/y
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Please give the explanation