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Problem
Problem
The potential difference between two points in a wire 75.0 cm apart is
0.938
V
0.938\ \text{V}
0.938
V
, when the current density is
4.40
×
10
7
A/m
2
4.40 \times 10^7\ \text{A/m}^2
4.40
×
1
0
7
A/m
2
. What is a. - the magnitude of
E
\mathbf{E}
E
in the wire? b. - the resistivity of the material of which the wire is made?
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