A stone of mass \( m \) is tied to a string and is moved in a vertical circle of radius \( r \) ...

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A stone of mass \( m \) is tied to a string and is moved in a vertical circle of radius \( r \) making \( n \) revolutions per minute. The total tension in the string when the stone is at its lowest point is
[Kerala (Engg.) 2001]
(a) \( m g \)
(b) \( m\left(g+\pi n r^{2}\right) \)
(c) \( m(g+\pi n r) \)
(d) \( m\left\{g+\left(\pi^{2} n^{2} r\right) / 900\right\} \)
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