A particle of mass m is moving around the origin with a constant force F pulling it towards the origin. If Bohr model is used to describe its motion, the radius of the n th orbit and the particle's speed v in the orbit depend on n as

1. A. r n 4/3 ; v n -1/3
2. B. r n 1/3 ; v n 1/3
3. C. r n 1/3 ; v n 2/3
4. D. r n 2/3 ; v n 1/3

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