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7.
a. A 60-(MHz) electromagnetic wave exists in an air-dielectric coaxial cable having an
inner conductor with radius a and an outer conductor with inner radius b. Assuming
perfect conductor, and the phasor form of the electric field intensity to be
E =
e-jkz (V/ m),
ax
i. find k,
ii. find H from the V X E equation. and
iii. find the surface current density

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