Physics Electromagnetic Induction BUMHS 2024
PMDC Verified Question 16 of 69
Let an inductor is connected with battery. If emf induced in the inductor opposes emf of battery, then electric current through the circuit is:
A
Decreasing
B
Increasing
C
Constant
D
Alternating
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Increasing
Concept:

An inductor acts to resist any change in the current flowing through it (a consequence of Lenz's Law).

Solution:

  • When current tries to increase (like when a switch is first closed), the expanding magnetic field induces a "Back EMF" that actively fights the battery's voltage to slow the current's growth.


  • If the current were decreasing, the inductor would induce a forward EMF (supporting the battery) to try to keep the current flowing.


  • Since the induced EMF is opposing the battery, the current must be increasing.


Why other options are incorrect:

If current is constant, induced EMF is zero. If current is decreasing, the induced EMF acts in the same direction as the battery, not opposing it.

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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