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An R-L series circuit consisting of constant reactance (X) but variable resistance (R), the locus of the __________ is a __________.
Frequency, Circle
Voltage, Circle
Current, Circle
Current, Parabola
Current,┬а ┬аCircle
Quick Trick: Understand that in an R-L circuit, current remains constant along a circle due to fixed reactance, making option C the best choice.
Understand that in an R-L circuit, current remains constant along a circle due to fixed reactance, making option C the best choice.
Identify the circuit type
The R-L circuit features constant reactance (X), meaning the current's behavior is governed by the variable resistance (R).
Understand the relationship
In an R-L circuit, as resistance changes while reactance remains constant, the current forms a circular path in the reactance-resistance plane.
Determine shape from parameters
The constant reactance defines the radius, and varying resistance creates the circular path of the current.
A: Frequency does not relate directly to a circle in this context. B: Voltage can change with resistance changes and does not describe a circular path. D: Current does not describe a parabola based on the resistive changes in an R-L circuit.
C is correct because the varying resistance around a fixed reactance creates a circular path of current values in the R-L circuit.
Similar questions may involve understanding the interplay of circuit components; always track how constant and variable elements affect the outcome.