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I'm not sure how to interpret 5. You have compared a given F, with and without B. But maybe they intend you compare some F in conjunction with B, for a total force of F+m_{B}g, with just a force F'=F+m_{B}g.
Does your general equation for part 6 produce the right answers for p=2, 3?
Does your general equation for part 6 produce the right answers for p=2, 3?