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A capacitor c is connected in series with a resistor r across a battery and an open switch. if a second capacitor of capacitance 2c is connected in parallel with the first one, the time constant of the new rc circuit will be

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naveen1997
Okay it would be really heplful if there was a figure present, now its not clear that where the capacitor (2C) is connected ? is it parallel with the R+C combination or just with C ?
still im going to assume that 2C is being connected with C in parallel
so 

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