Multi-step core is used in transformer to: A) Increase the output B) Decrease

Multi-step core is used in transformer to:
A) Increase the output
B) Decrease the cost of core material
C) Decrease the cost of copper
D) Increase the efficiency

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Multi-step core is used in transformer to: A) Increase the output B) Decrease the cost of core mat..

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Decrease the cost of copper

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