Physics Electromagnetic Induction UHS 2023
PMDC Verified Question 20 of 69
The induced emf produced in the coil is sometimes called as?
A
Self-inductance
B
Back emf
C
Motional emf
D
Mutual inductance
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Back emf
Concept:

When alternating current flows through a coil, it creates a changing magnetic flux that intersects the coil's own turns.

Solution:

  • According to Lenz's law, this self-induced EMF opposes the very change in current that created it.


  • Because it acts in direct opposition to the applied driving voltage, it is commonly referred to as a Back EMF.


Why other options are incorrect:

Self-inductance is a property of the coil (measured in Henrys), not the EMF itself. Motional EMF requires a conductor physically moving through a field. Mutual inductance involves two separate coils.

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