Question: A transformer cannot step - up or step - down a D . C voltage because a . D . C voltage is always comes

A transformer cannot step-up or step-down a D.C voltage because
a. D.C voltage is always comes in lower rate, so there is no need to change it
b. Electromagnetic induction is not valid, since the flux is zero
c. a D.C circuit has more losses
d. All of the given
A transformer cannot step - up or step - down a D

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