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

A conducting wire runs directly over a horizontal compass in the north-south direction. When a current of magnitude I passes through the wire, the compass needle swings 20° to the west and stays in that position.

When a current of 2I passes through the wire, the compass needle swings α° to the west and stops. What condition does α fulfill?

2. Relevant equations

I used M(couple moment) = BIANcosθ

3. The attempt at a solution

I am not sure that at does the moment between the 1st event (when I passes) and the 2nd event (2I passes) equal???

I guess it is not because I my answer is wrong when I assume like this... But what is the relationship between 1st and 2nd event for solving this problem...

Help is appreciate..

Thanks in advance :)

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# Homework Help: Conducting wire and moment

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