Recent content by alv

I know that as per Lenz's Law, back EMF moves in a direction so as to counter the flow of the changing magnetic flux which induced it in the first place. And it does so because if it flowed in the same direction it would contravene the law of conservation of energy as more and more energy would...

Thanks so much for these replies everyone. Much appreciated :smile:

I am a teacher and I can't work this one out. I am trying to answer (a). I have only included the further parts of the question (b, c and d) so you can see why some parts of the question are included. A single positively charged particle, mass 4.6 x 1027 kg, enters a 4.0 T magnetic field into...

I'm reading about delayed-choice experiments http://arxiv.org/pdf/1407.2930.pdf and in this sentence "In modern interferometric experiments, the wave nature of molecules of approximately 7000 atomic mass units and 1 pm de Broglie wavelength has been demonstrated" I can't figure out or find out...

Thanks heaps for this.

I'm actually a teacher and I can't explain this problem from the 2007 HSC. I've attached a copy of the question and the two graphs. The question shows a graph of change in magnetic flux vs time and asks you to choose which graph of induced emf best fits it. I don't understand why the induced emf...