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Inserting a soft iron core in a solenoid increases its self-inductance. Which quantity in the formula is responsible?
ALength l of the solenoid
BRelative permeability
CCross-section area A
DTurns per unit length n
Answer & Solution
Correct answer: B. Relative permeability
Self-inductance is proportional to the relative permeability of the core material, which is large for iron.
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