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physics

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a transformer has 200 turns in its primary coil, the potential difference across the transformer is 220V needs to operate an electrical instrument uses a 110 volts. the number of turns in its secondary coil is:
a) 100 turns
b) 200 turns
c) 110 turns
d) 220 turns

  • physics -

    to get half the voltage you need half as many turns in the secondary, so a.

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