Precautions are essential for ensuring that the secondary

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Precautions are essential for ensuring that the secondary of a CT is not open circuited when the primary circuit carries a current because

1. dangerously high voltage might develop across the secondary
2. the ferromagnetic core may develop residual magnetism
3. the reflected impedance may prevent the flow of current in the primary circuit
4. none of these

Correct Option: A

NA