A long solenoid is used as an inductor in an R-L circuit. The solenoid has 221/m and a cross-sectional radius of 0.15 meters. It is placed into a R-L circuit with a 17 Ohm resistor and a battery initially. The battery is removed, the initial current is 1 amps, and 8 milli-seconds after the battery has been removed, the voltage across the inductor is 9 volts. What is the length of the solenoid in meters?

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