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What is self induction?
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Self induction is the phenomenon where a changing current in a coil induces an electromotive force (emf) in the same coil itself.
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What is the unit of self inductance?
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The unit of self inductance is the Henry (H).
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What is the self-induced emf formula?
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The self-induced emf (E) can be calculated using E = -L(dI/dt), where L is the self inductance, and dI/dt is the rate of change of current.
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Explain Lenz's Law in the context of self induction.
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Lenz's law states that the direction of the self-induced emf opposes the change in current that produced it.
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What factors affect self inductance?
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Self inductance is influenced by the number of turns in the coil, the coil's area, the permeability of the core material, and the length of the coil.
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How does increasing the number of coil turns affect inductance?
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Increasing the number of turns in a coil increases its inductance because it increases the amount of magnetic flux for a given current.
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What is the physical significance of self inductance?
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Self inductance represents a circuit's ability to oppose changes in current due to its own magnetic field.
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Describe an application of self induction in technology.
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One common application is in transformers, where self inductance plays a role in energy transfer between circuits through electromagnetic induction.
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What role does a ferromagnetic core play in self inductance?
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A ferromagnetic core increases self inductance by concentrating and enhancing the magnetic field within the coil.
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Differentiate between self induction and mutual induction.
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Self induction refers to an emf induced in a single coil due to its own changing current, while mutual induction involves the inducing of emf in a secondary coil by the changing current in a primary coil.
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What is the significance of the sign in the formula E = -L(dI/dt)?
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The negative sign indicates Lenz's law, signifying that the induced emf opposes the change in current creating it.
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How is the energy stored in an inductor calculated?
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Energy stored in an inductor is calculated by the formula U = (1/2)L I^2, where U is the energy, L is inductance, and I is current.
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Why does self inductance make it difficult to switch off current in a circuit?
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Self inductance causes a back emf which opposes any change in current, making it difficult to abruptly stop the current.
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What analogy is commonly used to explain inductance?
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Inductance is often compared to mechanical inertia, where an inductor’s resistance to changes in current is likened to inertia's resistance to changes in velocity.
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Explain the concept of back emf in self induction.
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Back emf is the induced emf in an inductor when there is a change in current, opposing the original change in the circuit.
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