The equation of an alternating voltage is \( E=220 \sin (\omega \mathrm{t}+\pi / 6) \) and the e...

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The equation of an alternating voltage is \( E=220 \sin (\omega \mathrm{t}+\pi / 6) \) and the equation of the current in the circuit is \( I=10 \sin (\omega t-\pi / 6) \). Then the impedance of the circuit is
(a) \( 10 \mathrm{ohm} \)
(b) \( 22 \mathrm{ohm} \)
(c) \( 11 \mathrm{ohm} \)
(d) \( 17 \mathrm{ohm} \)
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