Practice question
Question
What is the gravitational force on a 8kg mass 5m from the center of a spherical shell of mass 400kg and radius 3m? (G\=6.67×10−11N m2/kg2)
Explanation
Outside shell: F = GMmr2. F = 6.67×10−11×400×852. F = 2.135×10−825≈8.54×10−10N. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 8.5 × 10⁻¹⁰ N. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.