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Self-inductance (L) is the ability of a circuit to oppose the magnetic flux that is produced by the circuit itself
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Running a changing current through a circuit creates a changing magnetic field, which creates an induced emf that fights the change
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Units are henrys (H)
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Self-inductance is purely a function of the circuit's geometry
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Calculate the self-inductance of a solenoid with 3400 turns of wire if the solenoid is 9 cm long and has a diameter of 11 cm.