Physics Electromagnetic Induction BUMHS 2022
PMDC Verified Question 50 of 69
As induced emf is produced in a circuit when:
A
Electric flux changes
B
Magnetic flux changes
C
Not magnetic flux produced
D
Magnetic flux remains constant
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Magnetic flux changes
Concept:

Faraday's Law of Electromagnetic Induction defines the fundamental condition for inducing voltage.

Solution:

  • An EMF is only induced in a conductive loop when the magnetic flux passing through that loop changes over time.


  • This can happen by changing the field strength, the loop's area, or the angle between them.


Why other options are incorrect:

If the magnetic flux remains constant (Option D), the derivative is zero, so EMF = 0. Changing electric flux induces magnetic fields (Maxwell's addition to Ampere's law), not standard motional EMF.

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