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Calculate the electric field in a copper...

Calculate the electric field in a copper wire of cross-sectional area 2.0 mm square carrying a current of 2 A. The resistivity of copper is `1.7 xx 10^(-8)Omega m`.

Text Solution

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Here, `A=2.0 mm sq = 2xx2 sq mm`
`=4xx10^(6) m^(2)`,
`I= 2A , rho =1.7 xx 10^(-8) Omega m`.
`E=V/l = (IR)/(l) = I/l (rho l)/(A) = (l rho)/(A)`
`=(2xx(1.7 xx 10^(-8)))/(4xx10^(-6)) = 8.5 xx10^(-3) V//m`
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