Tag: electro-magnetism

Quizzes (12) Questions (113)

Questions Related to electro-magnetism

Multiple choice physics electro-magnetism applications of electromagnets transformer transformers

A transformer works on the principle of

  1. self induction

  2. electrical inertia

  3. mutual induction

  4. magnetic effect of the electrical current
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Transformer is based on the principle of electromagnetic induction.
There are two coils named as primary and secondary wound on a soft iron core.
When AC is applied to the primary coi, the resulting current will the production of
continously varying magnetic flux.
Due to mutual induction, induced EMF is produced in secondary coil which in return results in current.  
Multiple choice physics electro-magnetism applications of electromagnets transformer transformers

Transformer is used to

  1. convert ac to dc voltage

  2. convert dc to ac voltage

  3. obtain desired dc power

  4. obtain desired ac voltage and current
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Transformer converts some value of voltage/current into some other desired value based upon the principles of mutual induction.
Transformer is based on the principle of electromagnetic induction. There are two coils named as primary and secondary wound on a soft iron core. When AC is applied to the primary coil, the resulting current will the production of continuously varying magnetic flux. Due to mutual induction, induced EMF is produced in secondary coil which in return results in current.