A 12-V Battery Is Connected in Series with a Switch,resistor

question 21

Multiple Choice

A 12-V battery is connected in series with a switch,resistor and coil.If the circuit's time constant is 2.0 x 10^-4 s and the final steady current after the switch is closed becomes 1.0 A,what is the value of the inductance?

• A)1.2 mH
• B)2.4 mH
• C)9.6 mH
• D)48 mH

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