An iron casting containing a number of cavities weights 6000 N in air and 4000 N in water. What is the volume of the cavities in the casting? Density of iron is 
. (Take, 
and density of water 
)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Let v be the volume of cavities and V be the volume of solid iron.
Then, 
Further, decrease in weight 
upthrust
or 
or 
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