Physics Electromagnetic Induction UHS 2023
PMDC Verified Question 18 of 69
In principle, the transformer consists of two coils of copper, electrically insulated from each other, wound on the same?
A
Iron core
B
Copper core
C
Gold core
D
Steel core
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Iron core
Concept:

To maximize efficiency, a transformer must guide nearly 100% of the primary coil's magnetic flux into the secondary coil.

Solution:

  • Soft Iron is a highly permeable ferromagnetic material.


  • Winding both coils on a laminated Iron core traps the magnetic field lines and funnels them directly from the primary to the secondary coil, preventing flux leakage.


Why other options are incorrect:

Copper and gold are excellent electrical conductors but poor magnetic conductors (they are non-magnetic). While some steel alloys are used, "soft iron" is the fundamental and most broadly correct generic textbook answer.

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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