Question

The value of gravitational acceleration g at the center of the earth is:-

• A. Infinite
• B. $9.8m/s^2$
• C. $32.2m/s^2$
• D. Zero

Answer 1

The correct option is D Zero

acceleration due to gravity varies directly proportional to distance from center, i.e. r<R.

But varies $\frac{1}{r^2}$ when r>R

expression is given by $g=\frac{GM}{r^2}$ if r>R.

and $g=\frac{GMr}{R^3}$ if r<R

so when $r=0$ then g will be zero.