Write the formula to find the magnitude of the gravitational force between the earth and an object on the surface of the earth.

Let m1 be the mass of the Earth and m2 the mass of an object on its surface. If r is the radius of the Earth, then according to the universal law of gravitation, the gravitational force (F) acting between the Earth and the object is given by the relation:
F=(Gm_1 m_2)/r^2

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