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Match List I with List II [Diagram: Table with List I (Isomeric pairs: A. Propanamine and N-Methylethanamine, B. Hexan-2-one and Hexan-3-one, C. Ethanamide and Hydroxyethanimine, D. o-nitrophenol and p-nitrophenol) and List II (Type of isomers: I. Metamers, II. Positional isomers, III. Functional isomers, IV. Tautomers)] Choose the correct answer from the options given below:

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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: [Diagram: Semicircular arc with mass m at center]

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