Physics Alternating Current PMDC Conceptual Practice
PMDC Verified Question 35 of 127
What is the inductive reactance of an ideal inductor connected to a steady direct current (DC) supply?
A
Zero
B
Infinite
C
\(1\ \Omega\)
D
Indeterminate
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Zero
Concept:

Inductive reactance depends directly on the frequency of the electrical source. For steady DC, frequency is zero.

Formula / Reaction:

$$X_L = 2\pi f L = 2\pi(0)L = 0$$

Solution:

  • Because steady DC does not change in magnitude or direction, \(\frac{di}{dt} = 0\).


  • No back emf is induced, so an ideal inductor offers zero reactance to steady DC and acts as a short circuit.


Why other options are incorrect:

  • Opt_B: Infinite reactance is exhibited by a capacitor in a DC circuit, not an inductor.


  • Opt_C: Reactance is zero for an ideal inductor.


  • Opt_D: The value is well-defined as \(0\ \Omega\).

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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