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Which one of the following field patterns represents a TEM wave travelling in the positive x direction?

1. E = +8ŷ, H = −4ẑ
2. E = −2ŷ, H = −3ẑ
3. E = +2ẑ, H = +2ŷ
4. E = −3ŷ, H = +4ẑ

Correct answer: E = −2ŷ, H = −3ẑ

Solution

A TEM wave's power flow S = E x H must be along +x. For E = -2y, H = -3z: (-2y)x(-3z) = +6(yxz) = +6x, the only choice giving +x. Options A, C, D all yield -x. So the correct answer is option 1, not the stored option 3.

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