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g decreases with altitude (option 1 correct), depth (option 2 correct), and is zero at the center (option 4 correct). Option 3 is incorrect as g decreases, not increases, below the surface.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.
g(h) = g0(1+h/RE)2. 6.12 = 9.8(1+h/RE)2. (1+h/RE)2 = 1.601. 1+h/RE = 1.601≈1.265. h/RE = 0.265. h = 0.265×6.4×106≈1.7×106m. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 1.7 × 10⁶ m. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.
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