(a) Just after the circuit is completed, what is the voltage drop across the cap

Question

(a) Just after the circuit is completed, what is the voltage drop across the capacitor?
_____ V

(b) Just after the circuit is completed, what is the voltage drop across the resistor?
_____ V

(c) Just after the circuit is completed, what is the charge on the capacitor?
_____ C

(d) Just after the circuit is completed, what is the current through the resistor?
_____ A

(e) A long time after the circuit is completed (after many time constants) what are the values of the quantities in parts (a) — (d)?

Explanation / Answer

given,

capacitance C=5 uF

Resistance R=8000 ohm

emf V=115 v

a)

voltage drop across capacitor is ,vC=zero

because initially it is uncharged capacitor

b)

voltage drop across resistor maximum,

vR=115 V

c)

initially,the charge on the capacitor q=zero

d)

current through resistor i=v/R

i=115/8000

=14.375 mA

after long time,

a)

voltage drop across capacitor is maximum

Vc=115 v

b)

voltage drop across resistor is VR=zero

c)

the charge on the capacitor

q=C*V

=(5*10^-6)*(115)

=5.75*10^-4 C

d)

current through resistor i=zero

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