If math xmlns=http://www.w3.org/1998/Math/MathMLmi mathvariant=norm...

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If math xmlns=http://www.w3.org/1998/Math/MathMLmi mathvariant=normaln/mimo,/momo /momi mathvariant=normale/mimo,/momo /momi mathvariant=normalm/mimo,/momo /momiτ/mi/math denotes number density of conduction electrons, charge on electron, mass of electron and average relaxation time respectively, then resistance of a wire of length math xmlns=http://www.w3.org/1998/Math/MathMLmo/momil/mimo/mo/math and area of cross-section math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymi mathvariant=normalA/mi/math, is
(1) math xmlns=http://www.w3.org/1998/Math/MathMLmiR/mimo=/momfracmrowmin/mimsupmie/mimn2/mn/msupmiτ/mi/mrowmim/mi/mfracmfracmil/mimiA/mi/mfrac/math
(2) math xmlns=http://www.w3.org/1998/Math/MathMLmiR/mimo=/momfracmrowmin/mimsupmie/mimn2/mn/msup/mrowmrowmim/mimiτ/mi/mrow/mfracmfracmil/mimiA/mi/mfrac/math
(3) math xmlns=http://www.w3.org/1998/Math/MathMLmiR/mimo=/momfracmim/mimrowmin/mimsupmie/mimn2/mn/msupmiτ/mi/mrow/mfracmfracmil/mimiA/mi/mfrac/math
(4) math xmlns=http://www.w3.org/1998/Math/MathMLmiR/mimo=/momfracmrowmim/mimsupmie/mimn2/mn/msup/mrowmrowmin/mimiτ/mi/mrow/mfracmfracmil/mimiA/mi/mfrac/math
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