1.

The volume of metallic hallow sphere is constant. If the order radius is increasint at thed rate of V cm/sec. Then the rate at which the inner radius increasing when the radii are a+d,a is

Answer»

`(V(a+d)^(2))/(a^(2))`
`(V(a+d))/(a)`
V(a+d)
a+d

Answer :A


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