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The reading of a spring balance when a block is suspended from it in air is 60 N. This reading is changed to 40 N when the block is submerged in water. The relative density of the block is:
A. `3`
B. `2`
C. `6`
D. `3//2`

1 Answer

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Best answer
Correct Answer - A
`mg = 60` …..(i)
`mg - rho_(i)vg = 40` …(ii)
`(mg - rho_(l)vg)/(mg) = (2)/(3)` or `(rho_(0))/(rho_(l)) = 3`
where `rho_(0) =` density of the block and `rho_(l) =` density of the liquid.

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