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If a direct current of value \( a \) ampere is superimposed
\( \mathrm{P} \) on an alternative current \( I=b \sin \omega t \) flowing through a wire, what is the effective value of the
W resulting current in the circuit?
(1) \( \left[a^{2}-\frac{1}{2} b^{2}\right]^{1 / 2} \)
(2) \( \left[a^{2}+b^{2}\right]^{1 / 2} \)
(3) \( \left[\frac{a^{2}}{2}+b^{2}\right]^{1 / 2} \)
(4) \( \left[a^{2}+\frac{1}{2} b^{2}\right]^{1 / 2} \)
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