user273872
• Member for 6 years, 7 months
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Yeah it requires insulation. I was confused about this too a long time ago, because all the motors I tore apart looked like they had bare copper wire windings, yet it makes sense that the current ...

If you think of the runner as being stationary and the ground as being the thing that moved, you can think of a rock hitting a rigid object off center. A torque is imposed on the body based on the ...

Check out the answer to this related question: How to wire a STRONG electromagnet? Note that the saturation of an electromagnetic core is happening because the external field can't do any more to line ...

Your sources were probably trying to keep you from getting confused when they threw in a minus sign later. Typically you deal with a positive scalar pressure which doesn't have a direction. But like ...

Newton devised a very good law of gravity (until Einstein came along) where the force between the two bodies is scaled by a very small number usually written as a capital G. It's a general law that ...

"is there interaction between photon and electric or magnetic field" With an everyday magnet not so much. With the strongest magnet in the universe, comprised of a super dense substance such as a ...

It looks like you set up your own problem, and you're confused that changing the resistors to arbitrary values (or number of windings), might violate power conservation. Are you sure Pin = Pout in ...

I'm not exactly sure on the details, but on a higher level the answer will have to do with conversion of energy. As the first battery is discharging, chemical energy converts to an electromotive ...

Aside from the "it's complicated answer," there's also the "check for prior experimental research" answer. Without digging into it very far I used one trick. I found this Wikipedia article on Laser ...

1: Mass of the planet and mass of the star determines the distance and then it's just a geometry problem, draw a triangle between the star and the moon and a point on the planet, think about eclipses. ...

All magnetic flux stems from movement of electric charge, so it makes sense that it can stimulate movement of electric charge. A permanent magnet has a certain magnetic field around it that is the ...