GATE EC 2014 Electromagnetics Solution Q 4

GATE EC 2014 Electromagnetics Solution Q 4

For a parallel plate transmission line, let v be the speed of propagation and Z be the characteristic impedance. Neglecting fringe effects, a reduction of the spacing between the plates by a factor of two results in_____.

(a) halving of v and no change in Z

(b) no changes in v and halving of Z

(c) no change in both v and z

(d) halving of both v and z

Ans :- (b)

Explanation

v_p=\frac1{\sqrt{\mu_0\;\in}}=\frac{3\times10^8}{\sqrt{\in_r}} Z_0\propto\ln\;D

So approximately it is proportional to distance, hence halved.

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