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The electric current in a discharging R-...

The electric current in a discharging R-C circuit is given by `i=i_0e^(-t/RC) where i_0` R and C are constant parameters and t is time. Let `i_0=2.00A, R=6.00xx10^5 ohm and C=0.500 muF`.
a. Find the current at t=0.3 s.
b. Find the rate of change of current at t=0.3 s.
Find approximately the current at t=0.31 s.

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