Physics · 2019
JEE Main · 9 January 2019, Shift 2 · Q21
A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns. The output power is…
A power transmission line feeds input power at $\displaystyle 2300$ V to a step down transformer with its primary windings having $\displaystyle 4000$ turns. The output power is delivered at $\displaystyle 230$ V by the transformer. If the current in the primary of the transformer is 5A and its efficiency is $\displaystyle 90$%, the output current would be :
Official answer
(3)
$\displaystyle 45$ A
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JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.