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Standard XII
Physics
Question

A step-up transformer of turns ratio 2 : 1 has 50 Hz AC voltage applied to primary. The frequency of AC output voltage across secondary is :
  1. Zero
  2. 25 Hz
  3. 50 Hz
  4. 100 Hz

A
Zero
B
50 Hz
C
100 Hz
D
25 Hz
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Solution
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Transformer never changes the frequency, they just adjust the voltage level to save energy.

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