Question

A tube is filled with some volume of mercury. 10 cm column of water is pored above mercury in left hand limb and another liquid of R.D = 0.8 is pored up to a height h in the right hand limb. In equilibrium level of mercury in the two limbs is same. h is

(a) 8.0 cm 

(b) 10.0 cm

(c) 12.0 cm 

(d) 12.5 cm

Answer 1

(d) 12.5 cm

Fig. shows the arrangement in equilibrium. Since level of mercury is same in the two limbs; pressure due to water column of height 10 cm must be same as pressure due to liquid column of height h cm. Therefore