Self induction is expressed as:
Correct answer: B. Option B
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation
Self-induction is expressed as: ε = -L di/dtThis equation tells us:ε (varepsilon): Represents the induced emf (electromotive force) in volts (V) that opposes the change in current.L: Represents the inductance of the coil in Henrys, which influences the magnitude of the induced emf.di/dt: Represents the rate of change of current (i) with respect to time (t) in amperes per second (A/s).In simpler terms: When the current in a coil changes, it creates a "self-induced" emf within the same coil that tries to oppose that change. The strength of this opposition depends on the inductance of the coil and the rate of change of the current.
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About Electromagnetic Induction
Changing magnetic flux induces an emf according to Faraday's law, while Lenz's law gives the direction that opposes the change producing it. Transformers apply induction between coils to step alternating voltage up or down, with turns ratio, current transformation and energy losses determining practical operation.
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