Q.

The place where potential energy is zero is     

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a

At height equal to double the radius of the earth

b

At infinity

c

At a height equal to half the radius of the earth

d

At a depth equal to 1/3 radius of the earth

answer is B.

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Detailed Solution

U=Gm1m2r

Distance between Earth and Object is Infinity PE is zero

 i.e., r then U0

So option (B) is correctly describing the requirement.

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