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Magnetism and electromagnetism - class-X
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In the transformer phase difference between input and output is
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A
$\pi$
💡 Explanation:
In an ideal transformer, the primary and secondary voltages are in phase if the secondary is open-circuited, but they are in anti-phase (180 degrees or pi radians) due to Lenz's law when considering the induced EMF relative to the primary input.