Question

The force of gravitation between objects of ordinary size kept at a distance of 1 metres from each other is of the order of ?

• A. 10 N
• B. 100 N
• C. 10^-8 N
• D. 10^-11 N

Answer 1

The correct option is D

10^-11 N

Step 1 Given

Distance between two objects of ordinary size is $1$m.

Step 2 To find the order of force of gravitation.

Let, the mass of objects of ordinary size be $1$ kg each and the distance between them is $1$ m. The gravitational force is given by

$$\begin{gathered} F=\frac{G{m}_1{m}_2}{r^2} \\ F=\frac{6.67\times {10}^{-11}\times 1\times 1}{1^2} \\ F=6.67\times {10}^{-11}N \end{gathered}$$

The order of gravitational force is ${10}^{-11}N$.

Hence, the correct option is (d).