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2 stars of masses M and 5M are separated by a distance X. Find the distance of 5M to a point at which net gravitational force on the third body would be

zero.justify your answer.



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There are two possibilities. The point P is distance d away from the mass of 5M. Let a third body of mass m be present at P.

Gravitational force due to 5M = G 5M m/ d² towards 5M.
Gravitational force due to M = G M m / (X-d)² towards M.

If the net force is zero, then the above forces are equal in magnitude.

So, equating both forces we get,  5/d² = 1/(X-d)²
       5X² + 5d² - 10 X d = d²
       4 d² - 10 X d + 5X² = 0

          d = [10 X +- √(100X² -80X²) ]/8 = (10 X +- 2√5 X )/8 = (5+-√5)X/4

Distance from 5M, d = 0.69 X  and  1.809 X
at which the net gravity is zero due to both masses.

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