Explain in words why each harmonic should have the approximate amplitude that it does in order to make up a triangle wave. for example, why are all the even harmonics zero? why is the third harmonic negative or positive? are the amplitudes different for sines and cosines? why?

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the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it

there are no components of a physical goal mentioned on the list of choices that you've provided.