`R_(eq)=(R_(1)R_(2))/(R_(1)+R_(2))`
`R_(1)=(l)/(k_(1)(piR^(2)))`, `R_(2)=(l)/(k_(2)3piR^(2))`
`R_(eq)=((l)/(piR^(2)))((l)/(piR^(2)))((l)/(k_(1)k_(2)))((1)/(3))`
`(l)/(piR^(2))(1)/(k_(1))+(1)/(3k_(2))`
`R_(New)=(l)/(k(4piR^(2))=R_(eq)`
`R_(eq)=(l)/(piR^(2))((1)/(3k_(2)+k_(1)))`
`(l)/(piR^(2)(4k))=(l)/(piR^(2))((l)/(3k_(2)+k_(1)))`
`impliesk=(3k_(2)+k_(1))/(4)`