Practice question
Question
What is the gravitational force on a 10kg mass outside a spherical shell of mass 500kg and radius 2m, at 3m from the center? (G\=6.67×10−11N m2/kg2)
Explanation
Outside a shell, F = GMmr2. F = 6.67×10−11×500×1032. F = 3.335×10−79≈3.71×10−8N. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 3.7 × 10⁻⁸ N. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.