A rigid bar of mass \( M \) is supported symmetrically by three wires each of length \( l \). Th...

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A rigid bar of mass \( M \) is supported symmetrically by three wires each of length \( l \). Those at each end are of copper and the middle one is of iron. The ratio of their diameters, if each is to have the same tension, is equal to
[NCERT Exemplar]
(a) \( Y_{\text {copper }} / Y_{\text {iron }} \)
(b) \( \sqrt{\frac{Y_{\text {iron }}}{Y_{\text {copper }}}} \)
(c) \( \frac{Y^{2} \text { iron }}{Y^{2} \text { copper }} \)
(d) \( \frac{Y_{\text {iron }}}{Y_{\text {copper }}} \)
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