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seen Jul 20 at 19:24

Feb
23
awarded  Popular Question
Jan
2
comment What happens when we connect a metal wire between the 2 poles of a battery?
I was looking for a clear explanation of how exactly electric fields appear along a circuit connected to a battery. This explanation is exactly what I was looking for.
Aug
10
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Aug
10
comment Rotational speed of a coil in a uniform magnetic field at equilibrium
Thank you for your help. This solution makes sense. As you said, this question seems to be poorly constructed, giving rise to many interpretation doubts. Therefore, many assumptions which are not stated in the question were needed in order to reach a solution that is close to the book's answer.
Aug
10
comment Rotational speed of a coil in a uniform magnetic field at equilibrium
Thank you for the answer. But I have another question: when you wrote that, if the motor has a commutator, $\langle \sin \theta \rangle \not = 0$, did you mean to say that only non-negative values of sine will be used, because torque doesn't change direction?
Aug
10
revised Rotational speed of a coil in a uniform magnetic field at equilibrium
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Aug
9
comment Rotational speed of a coil in a uniform magnetic field at equilibrium
@kleingordon: OK, I get it now. The only point that I am still missing is why exactly $\sin\theta$ has to equal $1$ for this to be true.
Aug
8
comment Rotational speed of a coil in a uniform magnetic field at equilibrium
Thank you for the reply. So, this equilibrium that the question is referring to is an instantaneous equilibrium, like @kleingordon said, rather than a permanent state of equilibrium? When you wrote $NAB\omega\sin\theta$ becomes zero, did you mean to say that $24 - NAB\omega\sin\theta$ becomes zero? Actually I think that I don't still quite understand how this makes the torque become zero.
Aug
8
comment Rotational speed of a coil in a uniform magnetic field at equilibrium
Thank you for the answer. But I don't quite see why $\sin \theta$ would necessarily stay equal to 1 in this case, because the motor continues to rotate.
Aug
5
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Jul
25
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Jul
23
revised Rotational speed of a coil in a uniform magnetic field at equilibrium
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Jul
19
revised Rotational speed of a coil in a uniform magnetic field at equilibrium
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18
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Jul
13
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Jul
11
revised Rotational speed of a coil in a uniform magnetic field at equilibrium
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Jul
11
asked Rotational speed of a coil in a uniform magnetic field at equilibrium