a. The switch S closes, how much is current and voltage drop across C1? b. After

Question

a. The switch S closes, how much is current and voltage drop across C1?

b. After a long time, the capacitor C1, will fully be charged, no current will flow throught it, then how much is the current and voltage drop through R2?

C. Notice, that R2 and C1 are in parallel, how much voltage drop through C1?

d. What is the time constant?

e. Write down the equation Vc(t) that reflect the relation between voltage drop across C1 and time t. Notice that swtich is closed at t=0.

f. What is the valvue at Vc at t=.03 according to results in e?

The switch is opened after t=.03s, so the battery is disconnected int eh circuit and the capacitor work like a battery. Will the capacitor be charged or discharged after t= .03? Does the time constant change? If so what is the new value of the time constant?

Explanation / Answer

a) current = 3/200 =0.015 , voltage drop is zero ... b) voltage = 3*100/300 = 3 V ,,,,

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