Tag: electro-magnetism

Questions Related to electro-magnetism

A transformer works on the principle of

physics electro-magnetism applications of electromagnets transformer transformers

  1. self induction

  2. electrical inertia

  3. mutual induction

  4. magnetic effect of the electrical current

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Correct Option: C
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.  

Transformer is used to

physics electro-magnetism applications of electromagnets transformer transformers

  1. convert ac to dc voltage

  2. convert dc to ac voltage

  3. obtain desired dc power

  4. obtain desired ac voltage and current

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Correct Option: D
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.  

Transformer can be used on;

physics electro-magnetism applications of electromagnets transformer transformers

  1. a.c. only

  2. d.c. only

  3. a.c. and d.c. both

  4. none of these

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Correct Option: A