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Question 20175
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Electromagnetic Induction and Alternating Current: Self-Inductance Definition MCQ

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Self-Inductance DefinitionEasyQuestion 20175

Question

Self-inductance L of a coil is defined by:
  1. A
    EMF = LdI/dt
  2. B
    EMF = −L(dI/dt)
    Correct
  3. C
    EMF = LI
  4. D
    EMF = L/I

Correct answer

EMF = −L(dI/dt)

Explanation

The back-EMF induced in a coil is ε = −L(dI/dt). L is the self-inductance (Henry). The negative sign reflects opposition to the changing current (Lenz's law).

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