Here's the question you clicked on:
tdabboud
What would you expect the current through a capacitor to look like if the voltage source is a square wave
a square wave should charge a capacitor in the same manner as a sine wave. Check this site out, it helps diagram the charge. http://hyperphysics.phy-astr.gsu.edu/hbase/electric/capchg.html
exponential increase then exponential decrease such as in a saw tooth plot?