(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

If you were given this question: http://img40.imageshack.us/img40/975/picture7we.png [Broken]

how would you go about solving it?

2. Relevant equations

I found a formula that makes this question seem a lot easier. Torque = NIAB. however, this formula is not on the formula sheet that is approved by the school so I am not supposed to know about it unless i figure out how to derive it. Does anyone know how this formula was derived?

3. The attempt at a solution

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# Physics 12 Help- Electomagnetism and Torque

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