A wooden block of mass m and density ρ is tied to a string ; the other end of the string is fixed to the bottom of the tank.The tank is filled with a liquid of density σ with σ ρ.What is the tension in the string
a) { 1 - (ρ /σ ) } m g b){ (σ /ρ ) - 1 } m g c) (ρ /σ ) m g d)(σ /ρ ) m g