a) When you choose the \"AC source with capacitor\" you will see an animation th
ID: 2154717 • Letter: A
Question
a) When you choose the "AC source with capacitor" you will see an animation that shows what is happening to the capacitor as the voltage changes in the circuit. The "+" and "-" symbols indicate positive and negative charge on the capacitor plates. For this situation, what do the purple arrows, directed from one capacitor plate to the other, indicate?The arrows indicate the magnitude and direction of the electric field between the plates.
The arrows indicate the magnitude and direction of the magnetic field between the plates.
The arrows indicate the flow of charge from one capacitor plate to the other.
The arrows are an indication of the current in the circuit.
(b) When you choose the "AC source with capacitor" you will see an animation that shows what is happening to the capacitor as the voltage changes in the circuit. The "+" and "-" symbols indicate positive and negative charge on the capacitor plates. For this situation, when does the magnitude of the current in the circuit reach its maximum value? Remember that current is the rate of flow of charge.
For a given value of capacitance the current is constant, so there are no particular times when it reaches maximum magnitude.
Current is proportional to voltage, so the maximum current is reached when the magnitude of the voltage is a maximum.
The current reaches maximum magnitude at times midway between when the voltage has maximum magnitude and when the voltage is zero, because this is where the slope of the voltage-vs.-time graph is maximum.
Charge is flowing most rapidly when the voltage passes through zero, so this is when the magnitude of the current is a maximum.
c) 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 passes through zero, because this is when the magnetic flux is changing most rapidly.
The magnetic field is produced by the inductor's inductive reactance.
The magnetic field is produced by the rate of change of the current in the inductor.
The magnitude of the voltage reaches maximum when the magnetic field reaches maximum strength in the inductor.
The magnetic field is produced by the current in the inductor.
Explanation / Answer
a) The arrows indicate the magnitude and direction of the electric field between the plates. b) Charge is flowing most rapidly when the voltage passes through zero, so this is when the magnitude of the current is a maximum. c) not sure
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