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Potential Gradient and Relation between Electric Field and Potential

A wire has a ...

Question

A wire has a length of 2.0 m and a resistance of 5.0 $Ω$ Find the electric field existing inside the wire if it carries a current of 10 A.

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Solution

$l = 2 m, R = 5 ω,$

$i = 10 A, E = ?$

$V = i R = 10 \times 5 = 50 V$

$E = \frac{V}{l} = \frac{50}{2} = 25 \frac{V}{m}$

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