$$ \text{An alternating current is given by } I=I_A\sin\omega t + I_B\cos\omega t. \text{ The r.m.s. current will be:} $$

A

$$\frac{|I_A+I_B|}{\sqrt{2}}$$

B

$$\sqrt{\frac{I_A^2+I_B^2}{2}}$$

C

$$\sqrt{I_A^2+I_B^2} $$

D

$$\frac{\sqrt{I_A^2+I_B^2}}{2}$$