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Question

Energy required to move a body of mass ‘m’ from an orbit of radius 2R to 3R is

A
GMm12R2
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B
GMm3R2
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C
GMm8R
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D
GMm8R
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Solution

The correct option is D GMm8R
Gravitational P.E=GMmrAt r=2R;E1=GMm2RAt r=3R;E2=GMm3RE2E1=GMm3R(GMm2R)ΔE=GMmR(1213)ΔE=GMm6R

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