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Turn ratio of a step-up transformer is $1 : 25$. If current in load coil is $2A$, then the current in primary coil will be :

$\begin{array}{1 1} (1)\; 25 A \\ (2)\; 50A \\ (3)\; 0.25 A \\ (4)\; 0.5 A \end{array}$

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