Out of the following, choose the wrong statement : (a) A transformer cannot work on d.c. (b) A t...

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Out of the following, choose the wrong statement :
(a) A transformer cannot work on d.c.
(b) A transformer cannot change the frequency of a.c.
(c) A transformer can produce a.c. power
(d) In a transformer, when a.c. voltage is raised \( n \) times, the alternating current reduces to \( 1 / n \) time.
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