x D Capacitors in Series and x D Capacitors in Series and x D Microsoft PowerPoi

Question

x D Capacitors in Series and x D Capacitors in Series and x D Microsoft PowerPoint D Capacitor Discharging x O x Midterm 2 Test version x LON-CAPA The Lea x f Facebook C i Securisé https//capa mcgil ca/uploaded/mcgily4c20042e9695458bamcgil12/default 48657606698297314865 76082-pag Due Friday March 17 02:00 pm (EDT) Problem 2 The circuit which was at po tion a for a long me is suddenly switched to position b at time r-0 a) Select the conect option for each statement True False) Fal T In the instant after the c is switched to posit b, the voltage aeross the resistor is zero. True The current through the Tesistor equals the current through the capacitor at all times. True In the instant after the circuit is switched to position b, the voltage across the capacitor is zero. False In the instant after the cucuut is swntched to posituon b. the current through the capacitor 15 zero. Submit Answer Incorrect Tries 2/6 Presious Tries b) What is at time t 2.000 milliseconds? DATA: R-515. 2. C-4.00 uF. Va 2.05V. Submit Answer Tries 0/6 c) What is the energy dissipated in the resistor after time E0 Submit Answer Tries 0 6 d Using the same data as above. consider the case when the switch is in position b for a long tume. then switched to position a at tume ra 0. What is Ve at time t 2.0 millisecond Submit Answer Tries 0'6 Due Friday March 17 02:00 pm (EDT A

Explanation / Answer

a)

In the instant after the circuit is switched to position b, the voltage across the resistor is zero: True

The current through the resistor equals the current through the capacitor at all times: False

Because: Current through the resistor plus the current through the capacitor equals to the voltage of battery at all times.

In the instant after the circuit is switched to position b, the voltage across capacitor is zero: False

Because: In the instant after the circuit is switched to position b, the voltage across capacitor is maximum.

In the instant after the circuit is switched to position b, the current across capacitor is zero: False

Because: In the instant after the circuit is switched to position b, the current across capacitor is maximum.

b)

For discharging phase we use equation,

Vt = Ve-t/ = Ve-t/RC = 2.05e-0.002/(515*0.000004) = 0.8 V

c)

For discharging phase we use equation,

Udiss = CV2/2 = (0.000004*2.05^2)/2 = 8.4*10^-6 J

d)

For charging phase we use equation,

Vt = V(1-e-t/ )= V(1-e-t/RC )= 2.05(1-e-0.002/(515*0.000004) )=1.24 V

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