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A metal wire of uniform mass density having length L and mass M is bent to form a semicircular arc and a particle of mass m is placed at the centre of the arc. The gravitational force on the particle by the wire is:

1. 2 L 2 GMm π
2. 0
3. 2 2 L GmM π
4. 2 L GmM 2 π

Correct answer: 2 L GmM 2 π

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