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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

1.  halving of $v$ and no change in $Z$
2. no changes in $v$ and halving of $Z$
3.  no change in both $v$ and $Z$
4. halving of both $v$ and $Z$

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