A resistance of \( 40 \Omega \) is connected to a source of \( \mat...

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A resistance of \( 40 \Omega \) is connected to a source of
\( \mathrm{P} \)
alternating current rated \( 220 \mathrm{~V}, 50 \mathrm{~Hz} \). Find the time
W
taken by the current to change from its maximum value to rms value
(1) \( 2.5 \mathrm{~ms} \)
(2) \( 1.25 \mathrm{~ms} \)
(3) \( 2.5 \mathrm{~s} \)
(4) \( 0.25 \mathrm{~s} \)
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