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Physics · Oct / Nov 2023 · Paper 11 · Question 32

5054The transformer

A charger for a mobile phone (cellphone) uses a transformer which steps the voltage down from 230 V to 5.0 V. The primary coil in the transformer has 2500 turns. How many turns are on the secondary coil?

  1. A11
  2. B54
  3. C500
  4. D11 500

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Correct answer: B. 54

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