My question is about the system in the picture. There is an upwards force which acts on the ring. My problem is that I don't see how it comes about. I mean, suppose that at time t, the current through the coil flows counterclockwise and is increasing. So there is an increasing, upward pointing magnetic field through the ring. That should induce a current on it in a clockwise direction. But then, according to the Lorentz force equation, the force on the ring should be sideways, isn't it? I mean it dosen't make sense that the force will be in the same direction as the magnetic field anyway, because [tex]\vec F = q(\vec{v} \times \vec{B})[/tex], so it has to be perpendicular to both v and B.(adsbygoogle = window.adsbygoogle || []).push({});

So how is that force created?

Thanks in advance,

Lior

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# A question about Faraday's law

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