An inextensible string of length $\ell$ fixed at one end,carries a mass $m$ at the other end. If the string makes $\frac{1}{\pi}$ revolutions per second around the vertical axis through the fixed end,the tension in the string is [The string makes an angle $\theta$ with the vertical]
- A$4\pi^2 m\ell$
- B$2\pi^2 m\ell$
- C$4 m\ell$
- D$m\ell$
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