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A heart defibrillator being used on a patient has an RC time constant of 9.1 ms...

A heart defibrillator being used on a patient has an RC time constant of 9.1 ms due to the resistance of the patient and the capacitance of the defibrillator. The defibrillator has an 7.9 μF
capacitance. If the initial voltage is 13 kV, how long, in milliseconds, does it take to decline to 540 v?

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