A light beam traveling in the negative z direction has a magnetic field B = (13.02
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A light beam traveling in the negative z direction has a magnetic field B̅ = (13.02 × 10-9 T)x` + (-5.28 × 10-9 T)y` at a given instant of time. The electric field in the beam has a magnitude of 1.82 N/C at the same time.
(a) Does the electric field at this time have a z component that is positive, negative, or zero? Explain.
(b) Write E̅ in terms of unit vectors.
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