A current of 1.5 A is maintained in a copper wire of length 1 m wit...

Question

A current of 1.5 A is maintained in a copper wire of length 1 m with area of cross-section $1.7 	imes 10^{-7}$ $m^2$. The magnitude of electric field in the wire is [Cu = $1.7 	imes 10^{-8}$ m)

Accepted Answer

Current density: $J=\dfrac{I}{A}=\dfrac{1.5}{1.7\times10^{-7}}=8.82\times10^{6}\text{ A/m}^2$

Electric field: $E=\rho J = (1.7\times10^{-8})\times(8.82\times10^{6})\approx0.15\text{ V/m}$

Answer: (A) 0.15 (V/m)

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