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A transformer is designed to convert voltage from 240 V a.c mains to 12 V ac, and has 4000 turns in its primary coil. The number of turns in its secondary coil is
200.
100.
120.
50.
480.
A step-up transformer
has the same primary voltage and secondary voltage.
has the same primary current and secondary current.
has a lower primary voltage than secondary voltage.
has a higher primary voltage than secondary voltage.
has a higher secondary current than primary current.