Question Detail
Question
The acceleration due to gravity at a depth d below the Earth's surface is given by:
Correct Answer
Option A is the correct answer.
Detailed Explanation
derives that g_d/g = (R_E - d)/R_E = 1 - d/R_E. Therefore, g_d = g(1 - d/R_E). This is a linear decrease with depth.
Hint
Only the mass inside the sphere of radius (R_E - d) contributes to gravity at depth d.