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Q.

Energy required in moving a body of mass m from a distance 2R to 4R from centre of earth of mass M is

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a

GMm12R2

b

GMm3R2

c

GMm8R

d

GMm4R

answer is D.

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Detailed Solution

Change in potential energy in displacing a body from r1 to r2 is given by∆U = GMm1r1 - 1r2  = GMm12R - 14R  = GMm4R
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