Question 1158658
Let {{{ R }}} = resistance in ohms
Let {{{ k }}} = constant of proportionality
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{{{ R = k*( L/D^2 ) }}}
{{{ R = 25 }}} ohms
{{{ L = 6.25 }}} in
{{{ D = .25 }}} in
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{{{ 25 = k*( 6.25 / .25^2 ) }}}
{{{ 25 = k*( 6.25 / .0625 ) }}}
{{{ 25 = k * 100 }}}
{{{ k = .25 }}}
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{{{ L = 40 }}}
{{{ D = .4 }}}
{{{ R = k*( L/D^2 ) }}}
{{{ R = .25*( 40/.4^2 ) }}}
{{{ R = .25*( 40/.16 ) }}}
{{{ R = .25*250 }}}
{{{ R = 62.5  }}} ohms
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check my math & get a 2nd
opinion if needed