What is the time constant of the circuit? 2.5 ms 0.4 ms none 1.25 ms 0.8 ms What

Question

What is the time constant of the circuit? 2.5 ms 0.4 ms none 1.25 ms 0.8 ms What is the value of the current at t = 0.8 ms? (1/10)e^-2 A 2 A e^-1 A 1 A 0.5 A What is the current right after the switch is closed? e^-2 A 2 A 0.1 A 0.5 A e^-1 A After the equilibrium established, switch S is opened and A and B points are connected. What is the current right at the moment of the connection is established? e^-2 A 0.5 A 2 A 0.1 A e^-1 A Waiting long time after the A and B point are connected, what will be the charge in C_1 ? 10 mu C 35 mu C 40 mu C 5 mu C 0 mu C

Explanation / Answer

C1 and C2 are in series connection.

1/C = 1/C1 + 1/C2 = 1/20 + 1/5

C = 4 uF

Time constant = RC = (100)(4 x 10^-6) = 0.4 x 10^-3 s

= 0.4 ms

Ans(b)

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I = Io [ e^(-t/T)]

I = (10 / 100) [ e^(-0.8 / 0.4)]

I = (1/10)e^-2

Ans(a)

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curent right after switched is closed .

Io = 10 / 100 = 0.1 A

Ans(c)
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I = 0.1 A

Ans(d)

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after long time, capacitor will be discharged again .

Ans: 0 uC

Option : (e)

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