Here it can be written as
V (t)/ Vo = e -t/RC
Since we need to solve for C so first we have to get rid of e
To remove e we take log both sides as
log(V(t)/Vo)=log(e-t/RC)
So, logV(t) - logVo = -t/RC
[When you divide two numbers, you subtract their logs]
Now C=-t/[(logv(t)-logvo)(R)]
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