The specific resistance of wire 1.1m long 0.4mm in diameter having resistance of 4.2 ohm will be
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given
Resistance R = 4.2 ohm
length of the conductor L= 1.1m
diameter=0 .4*10^-3 m
redius r=0.2*^-3 m
area of conducting wire A = L*2*π*r
R=rho*L/A
there fore rho (specific resistance)=R*A/L
=4.2*(L*2*π*r)/L
=4.2*2*π*r
=5.2752*10^-3 ohm-meter
Resistance R = 4.2 ohm
length of the conductor L= 1.1m
diameter=0 .4*10^-3 m
redius r=0.2*^-3 m
area of conducting wire A = L*2*π*r
R=rho*L/A
there fore rho (specific resistance)=R*A/L
=4.2*(L*2*π*r)/L
=4.2*2*π*r
=5.2752*10^-3 ohm-meter
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