A) \[\left( \frac{\eta -1}{\eta } \right)\,mg\]
B) \[\eta mg\]
C) \[\frac{mg}{\eta -1}\]
D) \[(\eta -1)\,mg\]
Correct Answer: D
Solution :
Tension in spring T = upthrust ? weight of sphere \[=V\sigma g-V\rho g\]\[=V\eta \rho g-V\rho g\] \[(\text{As }\sigma =\eta \rho )\] \[=(\eta -1)V\rho g\]= \[(\eta -1)mg.\]
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