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  4. A step up transformer has turn ratio 10: 1. A cell of emf 2 V is fed to the primary, then the secondary voltage developed is

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Q. A step up transformer has turn ratio $10: 1$. A cell of emf $2\, V$ is fed to the primary, then the secondary voltage developed is

ManipalManipal 2020

Solution:

A transformer is essentially an $AC$ device, it does not work on $DC$. So, voltage developed across secondary is zero.