Helping finding current thorugh capacitor?

The penetrator

New member
http://i56.tinypic.com/2pyqfrd.png
From the following circuit, how do i find R through the capacitor?
The current is 7.43<-42 mA.
Very confused how to find this, i don't know if i use 1/npiFc or what.
Explaining how to do this would help me a lot
 
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