R পৃথিবীর ব্যাসার্ধ হলে, ভূ-পৃষ্ঠ হতে কত উচ্চতায় g এর মান শূন্য হবে?

The correct answer is $\frac{R}{2}$, which suggests that the height at which the gravitational acceleration (g) becomes zero is equal to half the Earth's radius (R). Here’s why this is the correct answer:

Understanding Gravity:

    
• The force of gravity decreases as we move away from the Earth's surface.
    
• At a distance equal to the Earth's radius (R), the gravitational pull from the Earth is still significant, but it is not enough to make g zero.
    
• However, if we reach a distance of $\frac{R}{2}$ from the center of the Earth, we are at a point where the gravitational forces from different parts of the Earth will cancel out, resulting in no gravitational pull (g = 0).

Thus, to achieve a condition where g is zero, you need to be at a height of $\frac{R}{2}$ from the Earth's surface.

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