Solenoid on d.c. and then on a.c. of the same voltage: impedance and inductance

1. A.
   $200\,\Omega,\,0.55\text{ H}$
2. B.
   $100\,\Omega,\,0.8\text{ H}$
3. C.
   $300\,\Omega,\,1.2\text{ H}$
4. D.
   $200\,\Omega,\,1.5\text{ H}$

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1. A.
   $200\ \Omega,\ \frac{\sqrt{3}}{\pi}\ \text{H}$
2. B.
   $100\ \Omega,\ \sqrt{3}\ \text{H}$
3. C.
   $200\ \Omega,\ 1\ \text{H}$
4. D.
   $100\ \Omega,\ 1\ \text{H}$

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1. A.
   $48$ H
2. B.
   $12$ H
3. C.
   $4\pi \times 10^{-2}$ H
4. D.
   $8\pi \times 10^{-2}$ H

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