In a U-tube, water is poured into the left limb up to 20cm above the mercury–water interface. How much higher will the mercury level stand in the right limb compared to the left limb? (Density of mercury =13.6×103kgm−3; density of water =1.0×103kgm−3.)
a) 0.75cm
b) 3.0cm
c) 1.5cm
d) 1.6cm