Physics · 2018
JEE Main · 16 April 2018, Shift 1 · Q20
A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns, giving the output power…
A power transmission line feeds input power at $\displaystyle 2300$ V to a step down transformer with its primary windings having $\displaystyle 4000$ turns, giving the output power at $\displaystyle 230$ V. If the current in the primary of the transformer is $\displaystyle 5$ A, and its efficiency is $\displaystyle 90$%, the output current would be :
Official answer
(2)
$\displaystyle 45$ A
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JEE Main 2018 Physics question, with the answer from NTA’s final answer key. Where our answers come from.