CONCEPT: ●
Mutual induction: When an electric current is passed through a coil changes with time, an emf is induced in the nearby coil then this phenomenon is called mutual induction.
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Faraday's Laws of Electromagnetic Induction: Whenever the number of magnetic lines of force (magnetic flux) passing through a circuit/coil changes an emf is produced in the circuit called induced emf.
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Transformer: An electrical device that is used to transfer electrical energy from one electrical circuit to another is called a transformer.
◌ In a transformer, there are two coils-
Primary coil (P) and secondary coil (S).
● Both coils are electrically separate and inductive but are magnetically linked through the path of Reluctance.
● When the current in the primary coil is changed, the flux linked to the secondary coil also changes
● Consequently, an
EMF is induced in the secondary coil due to Faraday laws of electromagnetic induction. ● Electrical power transferred from the primary coil to secondary by magnetic flux and this phenomenon is called
mutual induction. EXPLANATION: From the above explanation, can say that,
● The transformer transfers the electrical energy from one circuit to another.
● The electrical energy is transferred via a
transformer using the electromagnetic induction concept. So option 4 is correct.
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Intensity: The magnetic energy falling per unit area per unit time is called magnetic intensity.
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Magnetic flux: The number of field lines passing a surface area normally is called magnetic flux.