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The ratios of length areas of cross-sec...

The ratios of length areas of cross-section and Young's modulii of steel of that of brass wires shown in the figure are a,b and c respectively . The ratio of increase in the lengths of brass of that of steel wires is [Assume that the masses of steel and brass wires are negligible]

A

`(4a)/(7bc)`

B

`(7 bc)/(4a)`

C

`(4bc)/(7a)`

D

`(7a)/(4bc)`

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