A thin rod of mass \( M \) and length \( L \) is bent in a semicircle as shown in figure (a). Wh...

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A thin rod of mass \( M \) and length \( L \) is bent in a semicircle as shown in figure (a). What is its gravitational force (both magnitude and direction) on a particle with mass \( m \) at \( O \) the centre of curvature ? (b) what would be the force on \( m \) if the rod is in the form of complete circle?
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