In an RC series circuit, ε = 12.0 V, R = 1.44 MΩ, and C = 1.83 µF. (a) Calculate the time constant. (b) Find the maximum charge that will appear on the capacitor during charging. (c) How long does it take for the charge to build up to 15.5 µC? g

dopamine..

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a.   mass number from atomic number

the answer is 12 as i may remember

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