Calculating Magnetic Flux: A Troubleshooting Guide

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Homework Statement



Please let me know whether it's wrong for my attached solution.

Homework Equations



magnetic flux = BAcosθ

The Attempt at a Solution



I don't know how to calculate the part (c) as attached file, please advise!
 

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Please advise!
 
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
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