16. A solid sphere of density

η ( > 1) times lighter than water is suspended in a water tank by a string tied to its base as shown in fig. If the mass of the sphere is m then the tension in the string is given by

(a)   [(  η – 1)/η]mg

(b)    ηmg

(c)   (mg)/ ( η -1 )

(d)  ( η -1 ) / (mg)

Answer-d