\( A \) and \( B \) are two wires and the radius of \( A \) is twice that of \( B \). They are s...

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\( A \) and \( B \) are two wires and the radius of \( A \) is twice that of \( B \). They are stretched by the same load, then the stress on \( B \) is
(a) equal to that on \( A \)
(b) four times that on \( A \)
(c) two times that on \( A \)
(d) half that on \( A \)
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