O-LevelPhysicsMagnetism5054/11 · Oct/Nov 2023 · Q321 Mark

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?

A11

B54

C500

D11500

✓ Correct answer

B: 54

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