Handwritten Problems RC Circuit Analysis (a) When the switch is open, what is th
ID: 2039883 • Letter: H
Question
Handwritten Problems RC Circuit Analysis (a) When the switch is open, what is the current through the 1032 resistor? (b) When the switch is open, what is the voltage across the capacitor? (c) Immediately after the switch is closed, what is the voltage across the capacitor? (d) Immediately after the switch is closed, what is the charge on the capacitor? (e) After the switch is closed, does the current through the resistor increase, decrease or stay the same? (f) After the switch has been closed a very long time, what is the current through the 10? resistor? (8) After the switch has been closed a very long time, what is the voltage across the capacitor? 60? 102 100V 40?Explanation / Answer
A) when the switch is open current will be 0 in 10ohm resistance.no EMF to provide current.
B) when the switch is open voltage will be 0 across the capacitor.no EMF to provide create potential difference btw capacitor plates.
C) when the switch is just closed voltage will be 0 across the capacitor plates since it acts as a short circuit till it is being charged. so no potential difference btw the plates.
D)the charge will be 0 immediately capacitor takes time to get charged to its max for applied potential. and the electromagnetic force has to reach there for it to begin the charging. so immediately charge will be 0.
E)After the switch is closed current through10 ohm decreases and finally becomes 0. current through 60ohm decreases and finally becomes constant at 1A. 100/(60+40)( 10 ohms is not included since charged capacitor acts as an open circuit.)
F)the current will be 0 since charged capacitor acts as an open circuit so resistance is infinity and current is hence 0.
G)The voltage across the capacitor will be voltage across 40 ohms ie 40 X 1A = 40V
at the steady-state current through 40 ohms is 1A.
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