Why a transformer cannot step up dc voltage?

When a d.c voltage source is applied across the primary of the transformer,the current in the primary coil remains constant. Hence there is no change in the magnetic flux linked with the secondary. Therefore the voltage across the secondary coil is zero.Thus a transformer can't step up dc voltage.

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it causes alternating magnetic flux that induces current

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 Thanks Preeti n pls try to answer my other questions also i need it urgently.......

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