Question 750403
{{{ R = k*L*( 1/D)^2 }}}
given:
{{{ 20 = k*200*(1/.25)^2 }}}
{{{ 20 = k*200*16 }}}
{{{ k = 20/( 200*16 ) }}}
{{{ k = .00625 }}}
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{{{ R = k*500*( 1/.25)^2 }}}
{{{ R = .00625*500*( 1/.25)^2 }}} 
{{{ R = 3.125*16 }}}
{{{ R = 50 }}}
The resistance is 50 ohms