- #1
Loonuh
- 10
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Homework Statement
I am working on a problem that states the following:
Imagine an infinite straight wire carrying a current I and uniformly
charged to a negative electrostatic potential Φ
I know here that the current I will set up a magnetic field around the wire that abides to the right hand rule with magnitude in Eqn. (1).
However, what is the importance of there being a negative electrostatic potential Φ? Does this mean that the wire sets up an electrostatic ##\vec{E}## field in addition to the magnetic field?
Homework Equations
##
\begin{align}
B(r) = \frac{I\mu_0}{2\pi r} \\
\nabla \cdot \vec{E} = 0
\end{align}
##
The Attempt at a Solution
##
\begin{align*}
\nabla \cdot \vec{E} &= 0\\
\frac{d^2 V}{dr^2} &= 0\\
\therefore V &= Cr + D\\
\end{align*}
##
At r = 0, V = ##\phi##
##
\begin{align*}
V = Cr + \phi
\end{align*}
##
At r = ##\infty##, V = 0 ...?
This can't possibly be right now and it appears I made some mistake.