Practice question

U = −GMEr. U = −6.67×10−11×6×10249.6×106. U = −4.002×10149.6×106 = −4.17×107J/kg. As per NCERT, applying relevant law/formula with correct units and sign convention leads to -4.2 × 10⁷ J/kg. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.