Practice question

Distance to midpoint: r = 2m. U = −Gm1r−Gm2r. U = −6.67×10−11(22+82). U = −6.67×10−11×(1+4) = −3.335×10−10J/kg. As per NCERT, applying relevant law/formula with correct units and sign convention leads to -3.3 × 10⁻¹⁰ J/kg. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.