1.

The acceleration due to gravity decreases by `Deltag_(1)` when a body is taken to a small height `h lt lt R.` The acceleration due to gravity decreases by `Deltag_(2)` when the body is taken to a depth h from the surface off the earth, then (R= Radius of the earth)A. `Deltag_(1)=Deltag_(2)`B. `Deltag_(1)=2Deltag_(2)`C. `Deltag_(2)=2Deltag_(1)`D. `Deltag_(1)=4Deltag_(2)`

Answer» Correct Answer - b
`g_(h)=g(1-(2h)/(R))`
`Deltag_(1)=g-g_(h)=(2hg)/(R)`
`g_(d)=g(1-(h)/(R))`
`Deltag_(2)=g-d_(d)=(gh)/(R)`
`therefore" "Deltag_(2)=2Deltag_(2).`


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