A solid sphere of density $\eta$ $( > 1)$ times lighter than water is suspended in a water tank by a string tied to its base as shown in fig. If the mass of the sphere is m then the tension in the string is given by
A solid sphere of density $\eta$ $( > 1)$ times lighter than water is suspended in a water tank by a string tied to its base as shown in fig. If the mass of the sphere is m then the tension in the string is given by
- A
$\left( {\frac{{\eta - 1}}{\eta }} \right)\,mg$
- B
$\eta mg$
- C
$\frac{{mg}}{{\eta - 1}}$
- D
$(\eta - 1)\,mg$
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- [IIT 1985]
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