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Longitudinal Stress

Two wires A ...

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Two wires A & B are of same material. Their lengths are in the ratio 1:2 & diameters are in the ratio 2:1. When stretched by forces FA & FB respectively, they got equal increase in their lengths. The ratio of FA:FB is- A) 1:2 B) 1:1 C) 2:1 D) 8:1

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