Practice question
Question
What is the gravitational potential due to Earth at 5.12×107m from its center? (ME\=6×1024kg,G\=6.67×10−11N m2/kg2)
Explanation
U = −GMEr. U = −6.67×10−11×6×10245.12×107. U = −7.8125×106J/kg. As per NCERT, applying relevant law/formula with correct units and sign convention leads to -7.8 × 10⁶ J/kg. This satisfies dimensional consistency and physical conditions given, so option A is scientifically correct.
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