An AC current is given by I=I_{1}\sin \omega t+I_{2}\cos \omega t. A hot wire ammeter will give a reading :
 
Option: 1 \sqrt{\frac{I_{1}^{2}-I_{2}^{2}}{2}}
Option: 2 \sqrt{\frac{I_{1}^{2}+I_{2}^{2}}{2}}
Option: 3 \frac{I_{1}+I_{2}}{\sqrt{2}}  
Option: 4 \frac{I_{1}+I_{2}}{2\sqrt{2}}

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