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Question

Transformers are used


A
in DC circuit only
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B
in AC circuits only
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C
in both DC and AC circuits
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D
neither in DC nor in AC circuits
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Solution

The correct option is A in AC circuits only
Transformers work on the principle of voltage induction by the linkage of changing magnetic flux between between the two cores. Changing magnetic flux requires changing/alternating current. 
Transformers are used only in AC circuits. In DC circuits, no alternating/changing magnetic flux is produced to induce voltage in secondary from the primary terminals of the transformers.

Physics

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