In a certain circuit current changes with time P according to \( i=...

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In a certain circuit current changes with time
P according to \( i=2 \sqrt{t} \). r.m.s. value of current

W between \( t=2 \) to \( t=4 \mathrm{~s} \) will be
(1) \( 3 \mathrm{~A} \)
(2) \( 3 \sqrt{3} \mathrm{~A} \)
(3) \( 2 \sqrt{3} \mathrm{~A} \)
(4) \( (2-\sqrt{2}) \mathrm{A} \)
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