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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > Three particles each of mass M are placed at the three corners of an equilateral triangle of side l. what is the force due to this system of particles on another particles of mass m placed at the midpoint of any side?

Three particles each of mass M are placed at the three corners of an equilateral triangle of side l. what is the force due to this system of particles on another particles of mass m placed at the midpoint of any side?

If the distance between centres of the earth and the moon is d and the mass of the earth is 81 times the mass of the moon the gravitational field will be zero? then at what distance from centre of the earth