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A resistor of R= 50 ohms is connected in series to a capacitor C=3.0 microfarads and a battery with emf=12.0 V. How long does it take for the capacitor to reach 40% of its max possible charge after the switch is closed?

a) 38.3 microseconds

b) 76.6 microseconds

c) 115 microseconds

C
20
S
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