In a black box of unknown elements ( \( \mathrm{L} \) or \( \mathrm...

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In a black box of unknown elements ( \( \mathrm{L} \) or \( \mathrm{R} \) or any other combination), an ac voltage \( \mathrm{E}=\mathrm{E}_{0} \) sin
\( \mathrm{P} \) \( (\omega t+\phi) \) is applied and current in the circuit was found to be \( I=I_{0} \sin [\omega t+\phi+(\pi / 4)] \). Then the
W unknown elements in the box may be
(1) Only capacitor
(2) Inductor and resistor both
(3) Either capacitor, resistor, and inductor or only capacitor and resistor
(4) Only resistor
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