A 200/100 V 50 Hz transformer is to be excited at 40 Hz

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A 200/100 V 50 Hz transformer is to be excited at 40 Hz from the 100 V side. For the exciting current to remain the same, the applied voltage should be

1. 150 V
2. 125 V
3. 100 V
4. 80 V

Correct Option: D

NA