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## Homework Statement

I have the circuit above.

When I have the switch at A, the capacitor C1 is charging at 100μF is at 10V.

I then discharge the capacitor by connecting the switch to B.

I was asked to calculate the time constant.

I thought the capacitors were in parallel but according to the answer, C1 and C2 are in series.

I calculated the time constant to be 20 seconds, but the answer was apparently 5 seconds as C1 and C2 were in series.

I attempted a similar question as shown below.

but they said that the total capacitance was 6.0μF where the capacitors were in parallel for part (i) which I can understand.

So who is correct for the first question?

## Homework Equations

T = CR

## The Attempt at a Solution

Total C = 100 + 100 = 200μF

So T = 100x10

^{3}x 200x10

^{-6}= 20 seconds.