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E1 = ˆexA cos(kz – ωt)

E2 = ˆeyB cos(kz – ωt + Φ)

Describe the temporal behavior of the total electric field E = E1 + E2 for the following (ex. linearly polarized, elliptically polarized, etc.)

cases:

A = B, Φ = 0

A = B, Φ = π

A = B, Φ = π/2

A = B, Φ = π /4

Repeat the exercise for A = 2B.

of a combination of 7.2 × 1013 protons

and 9.0×1013 electrons. The elemental charge

is 1.6 × 10−19 C.

Answer in units of C.