Practice question
Question
What is the gravitational force on a 11kg mass 9m from the center of a spherical shell of mass 500kg and radius 7m? (G\=6.67×10−11N m2/kg2)
Explanation
Outside shell: F = GMmr2. F = 6.67×10−11×500×1192. F = 3.6685×10−881≈4.53×10−10N. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 4.5 × 10⁻¹⁰ N. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.