7. The crosssectional area of wire is given by
A
=
π
r
2
, where
r
is its radius (half its
thickness). The magnitude of the current density vector is
J
i
A
i
r
=
=
/
/
π
2
, so
r
i
J
=
=
×
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 Spring '10
 Rebello,NobelS
 Current, The Current, Lp space, current density vector

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