Physics Electromagnetic Induction SZABMU 2023
PMDC Verified Question 26 of 69
The transformer depends on the use of:
A
Direct current
B
Alternating current
C
Direct and alternating current
D
Direct and alternating voltage
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Alternating current
Concept:

Transformers rely on mutual induction, which fundamentally requires a changing magnetic field to function.

Solution:

  • Only an Alternating Current (AC) naturally and continuously reverses direction, thereby producing the continuously changing magnetic flux needed to induce an EMF in the secondary coil.


Why other options are incorrect:

Direct Current (DC) produces a constant, static magnetic field. A static field results in \( \Delta \phi = 0 \), meaning zero induced EMF. Therefore, transformers cannot work on DC.

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