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The output voltage seen at the CRO connected at the secondary terminals is square wave. Then the flux density used for energizing the primary is?

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The output voltage seen at the CRO connected at the secondary terminals is square wave. Then the flux density used for energizing the primary is?

(a) triangular

(b) sinusoidal

(c) saw tooth wave

(d) square wave

The question was posed to me by my school teacher while I was bunking the class.

This intriguing question originated from Transformer Phasor Diagram topic in division Transformers of Electrical Machines

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Right option is (a) triangular

For explanation: E = -N*dϕ/dt. Integration of square wave will be triangular in nature.

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