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Physics · Oct / Nov 2018 · Paper 11 · Question 34

5054The transformer

A 12 V lamp glows at normal brightness when connected to the secondary coil of a mains transformer. The mains voltage is 240 V. The transformer is 100% efficient and the primary coil has 200 turns. How many turns are there on the secondary coil?

  1. A10
  2. B14
  3. C4000
  4. D580 000

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Correct answer: A. 10

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