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Question:
why gravitation is weak force
Answer:

The interaction of two or more objects or bodies is usually mentioned in terms of coupling. Coupling is a kind of force which connects or binds the objects or bodies together. This makes the gravitational force as a weak force.

In the case of forces like Nuclear, electromagnetic and gravitation forces, the coupling constants are different. The coupling constant for gravitation is dependent on G which is universal gravitational constant, numerically equal to 6.67 * 10-11 Nm2 / Kg2.

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