The electric fields from three coherent sources are described by E1 = E0 sin -t, E2 = E0 sin (wt + ǿ), and E3 = E0 sin (wt + 2ǿ). Let the resultant field be represented by EP = ER sin (wt + a). Use phasors to find ER and 1 when
(a) Ǿ = 20.0°,
(b) Ǿ = 60.0°, and
(c) Ǿ = 120°.
(d) Repeat when ǿ = (3π/2) rad. |

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