Faraday\'s Law is helpful for understanding what is going on in the inductor. Fa
ID: 2289678 • Letter: F
Question
Faraday's Law is helpful for understanding what is going on in the inductor. Faraday's Law states that the voltage across the inductor is proportional to the negative of the rate of change of magnetic flux in the inductor. When will the voltage across the inductor reach its maximum magnitude, and what produces the magnetic field in the inductor? Select the two true statements from the list below.
The magnitude of the voltage reaches maximum when the magnetic field reaches maximum strength in the inductor.
The magnitude of the voltage reaches maximum when the magnetic field passes through zero, because this is when the magnetic flux is changing most rapidly.
The magnetic field is produced by the current in the inductor.
The magnetic field is produced by the rate of change of the current in the inductor.
The magnetic field is produced by the inductor's inductive reactance.
Explanation / Answer
It's d and e. (e) is true because the magnetic field around any condcutor is proportional to its current, and that's true whether it's wound into a coil forming an inductor or not. And (d) is a consequence of (e) ... you haven't described the type of current, but assuming it's a sine wave, when that current is flowing through an inductor, it is changing most rapidly when the value of the current passes through zero. And since flux is proportional to current, that is also when flux is changing most rapidly.
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