A transformer works on the principle of
Correct answer: B. mutual induction between two coils linked by a common changing flux
- A. self induction only
- B. mutual induction between two coils linked by a common changing flux
- C. electrostatic attraction
- D. the motor effect
Explanation
Alternating current in the primary produces a continuously changing flux, which the laminated iron core carries to the secondary, where it induces an alternating emf. Since the process depends entirely on a changing flux, a transformer cannot work on direct current. Self induction is the related effect a single coil has on itself.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Transformers
Transformers transfer alternating electrical energy between coils by mutual induction, with voltage ratio determined by the turns ratio. The topic covers step-up and step-down transformers, current changes, ideal power conservation and practical losses such as heating and flux leakage. A transformer requires changing magnetic flux, so it does not operate with steady direct current.
Practise Electromagnetic Induction
288 free Electromagnetic Induction MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.