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The proportionality of flux to current holds if the coil geometry is:
AExpanding
BRotating
CUnchanging
DCollapsing
Answer & Solution
Correct answer: C. Unchanging
1. The relation between flux and current depends on the shape.
2. A changing shape would change that relation as well.
3. So the geometry must not vary with time.
_Source: NCERT Class 12 Physics Part I, Chapter 6, Electromagnetic Induction._
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