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The secondary circuit of a C.T. is open when?

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in Electrical Measurements by (148k points)
The secondary circuit of a C.T. is open when?

(a) a very high flux density is produced

(b) a very low flux density is produced

(c) a moderate flux density is produced

(d) no flux density is produced

This question was posed to me during an online exam.

Asked question is from Open Circuiting the Secondary Circuit of a Current Transformer topic in chapter Extension of Instrument Ranges of Electrical Measurements

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Correct choice is (a) a very high flux density is produced

To elaborate: When current is flowing in the secondary circuit which is kept open in a C.T., a very high flux density is produced in the core as a result of the absence of demagnetizing ampere turns.

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