The correct graph between the frequency $n$ and square root of density ($\rho$) of a wire, keeping its length, radius and tension constant, is
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(c)We know frequency $n = \frac{p}{{2l}}\sqrt {\frac{T}{{\pi {r^2}\rho }}} $==> $n \propto \frac{1}{{\sqrt \rho }}$
i.e., graph between $n$ and $\sqrt \rho $ will be hyperbola.
i.e., graph between $n$ and $\sqrt \rho $ will be hyperbola.
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