An e.m.f. \( E=4 \cos (1000 t) \) volt is applied to an LR- \( \mat...

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An e.m.f. \( E=4 \cos (1000 t) \) volt is applied to an LR-
\( \mathrm{P} \) circuit of inductance \( 3 \mathrm{mH} \) and resistance 4 ohms.

W The amplitude of current in the circuit is
(1) \( \frac{4}{\sqrt{7}} A \)
(2) \( 1.0 \mathrm{~A} \)
(3) \( \frac{4}{7} \mathrm{~A} \)
(4) \( 0.8 \mathrm{~A} \)
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