The Electric Fields Arriving at a Point P from Three

question 42

Multiple Choice

The electric fields arriving at a point P from three coherent sources are described by E₁ = E₀ sin ωt, E₂ = E₀ sin (ωt + π/4) and E₃ = E₀ sin (ωt + π/2) . Assume the resultant field is represented by Ep = ER sin (ωt + α) . The amplitude of the resultant wave at P is

• A)E₀.
• B)1.5E₀.
• C)1.7E₀.
• D)2.4E₀.
• E)2.9E₀.

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