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A rigid bar of mass 15 kg is supported s...

A rigid bar of mass 15 kg is supported symmetrically by three wires each 2.0 m long. Those at each end are of copper and the middle one is of iron. Determine the ratios of their diameters if each is to have the same tension.

A

`sqrt(11/19)`

B

`sqrt(19/11)`

C

`sqrt(30/11)`

D

`sqrt(11/30)`

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