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1. Magnetic Flux Lines

   Linked via "coil of wire"

   $$\Phi = \iint_S \mathbf{B} \cdot d\mathbf{A}$$
   When flux lines thread through a closed loop or coil of wire, the resulting flux linkage ($\Lambda$) is critical for understanding electromagnetic induction, as described by Faraday's Law. For a coil with $N$ turns, the linkage is $\Lambda = N\Phi$.
   The standard unit for magnetic flux is the Weber ($\text{Wb}$), equivalent to one [Tesla-…