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Math Help - Voltage drops and time constants in d.c. circuit???

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    Voltage drops and time constants in d.c. circuit???

    Hello, I have the following question if anyone can help it would be greatly appreciated:

    An inductor of negligible resistance and an inductance of 0.2 H is

    connected in series with a 330 resistor to a 12V d.c. supply.

    Determine:

    (a) the time constant of the circuit

    (b) the voltage drop across the inductor after two time constants

    (c) the voltage drop across the resistor after three time constants

    (d) the resistance of a 0.2 H coil used to replace the inductor if the

    circuit’s time constant falls to 0.55 ms.


    I've attached my (rough!) answers, can anyone check if they agree please?
    Thanks
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