In a step-up transformer, the turn ratio is 1 | vedclass

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(D) Transformer works on the principle of mutual induction, which requires a time-varying magnetic flux to induce an electromotive force $(EMF)$ in th

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(D) Transformer works on the principle of mutual induction, which requires a time-varying magnetic flux to induce an electromotive force $(EMF)$ in the secondary coil.Since a Leclanche cell provides a constant direct current $(DC)$, the current flowing through the primary coil is constant.A constant current produces a constant magnetic flux, meaning the rate of change of flux $(\frac{d\phi}{dt})$ is zero.According to Faraday's law of electromagnetic induction, the induced $EMF$ is given by $e = -N \frac{d\phi}{dt}$.Since $\frac{d\phi}{dt} = 0$, the induced $EMF$ in the secondary coil is $0\,V$.

In a step-up transformer, the turn ratio is $1:2$. A Leclanche cell $(e.m.f. 1.5\,V)$ is connected across the primary. The voltage developed in the secondary would be.......$V$

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