The electric current in a charging R-C circuit is given by 
where 
R and C are constant parameters of the circuit and t is time. Find the rate of change of current at (a) t = 0, (b) t = RC, (c) t = 10 RC.
To find out the rate of change of current, we should differentiate i with respect to the time t.
(a) At t= 0,
(b) At t = RC,
(c) At t = 10RC
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