A 12-V battery is connected in series with a switch, resistor, and coil. If the circuit's time constant is 2.0 × 10^-4 s and the final steady current after the switch is closed becomes 2.0 A, what is the value of the inductance?
a. 2.4 mH
c. 9.6 mH
b. 48 mH
d. 1.2 mH
D
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