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Which among the following, is not a cause for the power loss in a transformer-

(i) Eddy currents are produced in the soft iron core of a transformer.

(ii) Electric Flux sharing is not properly done in primary and secondary coils.

(iii) Humming sound produced in the transformers due to magnetostriction.

(iv) Primary coil is made up of a very thick copper wire.

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Correct option is (iv) Primary coil is made up of a very thick copper wire.

Explanation:

Correct statement is option (iv) as Primary coil made of Thick Coper wire has very less R. Therefore negligible power loss. Rest all options are reasons for power losses in a transformer.

Power loss happens due to Eddy current, Flux loss and Hysteresis. But in a transformer, the primary coil is made up of a very thick copper which has very less resistance and therefore negligible power loss due to heat.
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