Question

Two long straight wires enter a room through a window. One carries a current of 3.0 ???? into the room while the other carries a current of 5.0 ???? out. The magnitude in Tm of the path integral ∮ ????⃗ ∙ ???????? around the window frame is:

Answer 1

Answer:

$\begin{equation}\\\oint_LB.dl\\\end{equation}$ = -8πx$10^{-7}$

Explanation:

If you need calculate

$\begin{equation}\\\oint_L B.dl\\ \end{equation}$

You can use the Ampere's Law

$\begin{equation}\\\oint_L B.dl\\ \end{equation}$ = $I_{in}$μ

   

      Where $I_{in}$: Current passing through the window

                   μ : Free space’s magnetic permeability

                   μ = 4πx$10^{-7} T.m.A^{-1}$

Then

$\begin{equation}\\\oint_L B.dl\\ \end{equation}$ = (3-5)4πx$10^{-7}$

$\begin{equation}\\\oint_L B.dl\\ \end{equation}$ = -8πx$10^{-7}$