Question

please answer this ​

Answer 1

Answer:

A

Explanation:

According to Junction Rule,

I3= I1+ I2

   = 3A sin wt + 4A cos wt

   = 5A (3/5 sin wt + 4/5 cos wt)                    [Multiplying and Dividing with 5]

   = 5A (cos 53o sin wt + sin 53o cos wt)       [cos 53o = 3/5 and sin 53o = 4/5]

   = 5A sin (wt+53o)                                   [sin (A+B) = sin A cos B + cos A sin B]