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A cubical block of steel of each side equal to \( l \) is floating on mercury in a vessel. The densities of steel and mercury are \( \rho_{s} \) and \( \rho_{m} \). The height of the block above the mercury level is given by
(a) \( l\left(1+\frac{\rho_{s}}{\rho_{m}}\right) \)
(b) \( l\left(1-\frac{\rho_{s}}{\rho_{m}}\right) \) (c) \( l\left(1+\frac{\rho_{m}}{\rho_{s}}\right) \)
(d) \( l\left(1-\frac{\rho_{m}}{\rho_{s}}\right) \)
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