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electronics and communication engineering electromagnetic field theory
1. For EM wave propagation in free space, the free space is defined as
(A): σ ≠ 0, ε > 1, μ < 1, ≠ 0, = 0
(B): σ = 0, ε = 1, μ ≠ 1, = 0
(C): σ = 0, ε = 1, μ = 1, ≠ 0, ≠ 0
(D): σ = 0, ε = 1, μ = 1, = 0, = 0
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