# Second Year Physics Alternating Current

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$16.2 A sinusoidal A.C. has a maximum value of 15 \mathrm{~A} . What are its rms values? If the time is recorded from the instant the current is zero and is becoming positive what is the instantaneous value of the current after 1 / 300 \mathrm{~s} given the frequency is 50 \mathrm{~Hz} .(Ans: I_{\text {ma }}=10.6 \mathrm{~A} Instantaneous current =13.0 \mathrm{~A} )$

$16.7 Find the value of the current flowing through a capacitance 0.5 \mu \mathrm{F} when connected to a source of 150 \mathrm{~V} at 50 \mathrm{~Hz} .(Ans: I_{m s}=0.024 \mathrm{~A} )$

$16.5 How does doubling the frequency affect the reactance of (b) a capacitor?$

$16.3 How many times per second will an incandescent lamp reach maximum brilliance when connected to a 50 \mathrm{~Hz} source?$

$16.6 A 10 \mathrm{mH} 20 \Omega coil is connected across 240 \mathrm{~V} and 180 / \pi \mathrm{Hz} source. How much power does it dissipate?(Ans: 2778W)$

$16.2 Name the device that will (a) permit flow of direct current but oppose the flow of alternating current$