Negative time constant?

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xfollowthereaperx

Joined Jan 11, 2012
4
Doing a prelab and my time constant and back resistance on diode don't seem correct. The work is in attachments, variables are as follows:

i_c=2.0 A at t=0+
V_c=-10 V at t=0
V_c=-5 V at t=250sec

Answers are as follows:

L= 0.25mH
\(\tau\)= -360.7
R= -36.07*10^6 ohms

My concern is that my tau and R are negative numbers.
 

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