When we study the phenomenon mutual induction between two coils, the primary coil consists of:
Correct answer: A. A rheostat and battery
- A. A rheostat and battery
- B. A rheostat and galvanometer
- C. Galvanometer only
- D. None of these
Explanation
When studying the phenomenon of mutual induction between two coils, the primary coil typically consists of: A rheostat and battery.The rheostat is used to vary the current passing through the primary coil, thus changing the magnetic flux linked with the secondary coil. The battery serves as a source of electric potential difference to drive the current through the primary coil. This setup allows for the controlled variation of the magnetic flux, which in turn induces an electromotive force (EMF) in the secondary coil as per Faraday's law of electromagnetic induction.
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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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