Question Detail
Question
The value of acceleration due to gravity at the center of the Earth is:
Correct Answer
Option D is the correct answer.
Detailed Explanation
At the center of the Earth, the depth d = R_E. Substituting into g_d = g(1 - d/R_E) gives g_d = g(1 - R_E/R_E) = 0. The gravitational pull from all directions cancels out.
Hint
As you go deeper, less mass is below you pulling you down. What happens at the very center?