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Physics · GRAVITATION
हिन्दीTwo uniform solid spheres of radii \( R \) have masses \( M \) and \( 4M \), and their centres are separated by a fixed distance of \( 6R \). The distance from the centre of the sphere of mass \( M \) along the line joining their centres where the net gravitational force on a test particle is zero is:
Correct answer · Option 3
\( 2R \)
Explanation
At the neutral point, \( \frac{GMm}{r^2} = \frac{4GMm}{(6R-r)^2} \implies (6R-r)^2 = 4r^2 \implies 6R-r = 2r \implies r = 2R \).
