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Q.

A and B are two wires. The radius of A is twice that of B. They are stretched by the same load. Then the stress on B is

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a

Equal to that of A

b

Four times that of A

c

Two times that of A

d

Half that of A

answer is B.

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Detailed Solution

Stress = force  Area ∴ Stress ∝1πr2SBSA=rArB2=(2)2 ⇒SB=4SA
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