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एक ही धातु के बने दो तारो पर समान विभवांतर लगाया गया है । उनमे धाराओं का अनुपात क्या होगा यदि -
(i) दोनों तारो के अनुप्रस्थ क्षेत्रफल समान है तथा लम्बाइयों में अनुपात 2 : 1 है ।
(ii ) दोनों तारो की लम्बाई समान है तथा अनुप्रस्थ क्षेत्रफल का अनुपात 2 : 1 है ।

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`R=(rhoL)/(A) " " therefore " " I=V/R=(VA)/(rhoL)`
अथवा `IpropA/L " " (therefore " V तथा " rho` नियत है )
अतः (i) `I_1:I_2=L_2:L_1=1:2`
(ii) `I_1:I_2=A_1:A_2=2:1`

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