Taking the gravitational potential at a point infinte distance away as zero, the gravitational potential at a point A is −5 unit. If the gravitational potential at a point infinite distance away is taken as +10 units, the potential at a point A is
−5 unit
+5 unit
+15 unit
+10 unit
A
+5 unit
B
+10 unit
C
+15 unit
D
−5 unit
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The gravitational potential V at a point distance ′r′ from a body a mass m is equal to the amount of work done in moving a unit mass from infinity to that point Vr−V∞=−∫r∞¯E.d¯r=−GM(1/r−1/∞) =−GMr[As¯E=−dVdr]
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