In an ideal transformer, the turns ratio is $\frac{N_P}{N_S}=\frac{1}{2}$ . The ratio $V_S:V_P$  is equal to (the symbols carry their usual meaning) :

<p><span lang="EN-IN">According to transformer ratio, </span></p><p><span lang="EN-IN"><span class="mathml" contenteditable="false"> <math> <mrow> <mfrac> <mrow> <msub> <mrow> <mi>V</mi> </mrow> <mrow> <mi>S</mi> </mrow> </msub> </mrow> <mrow> <msub> <mrow> <mi>V</mi> </mrow> <mrow> <mi>P</mi> </mrow> </msub> </mrow> </mfrac> <mo>=</mo> <mfrac> <mrow> <msub> <mrow> <mi>N</mi> </mrow> <mrow> <mi>S</mi> </mrow> </msub> </mrow> <mrow> <msub> <mrow> <mi>N</mi> </mrow> <mrow> <mi>P</mi> </mrow> </msub> </mrow> </mfrac> <mo>=</mo> <mn>2</mn> <mo>:</mo> <mn>1</mn> </mrow> </math> </span><br>&lt;!- [endif]-&gt;&lt;!- [if gte mso 9]>&lt;xml&gt; <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1025" DrawAspect="Content" ObjectID="_1816517204"> </o:OLEObject>&lt;/xml&gt;&lt;! [endif]-&gt;</span></p>

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