\left\{ \begin{array} { l } { E = \frac { B L } { 2 } } \\ { E = 4 I } \\ { B I = 1 } \end{array} \right.
Solve for E, B, L, I
E=4I\text{, }B=\frac{1}{I}\text{, }L=8I^{2}\text{, }I<0
E=4I\text{, }B=\frac{1}{I}\text{, }L=8I^{2}\text{, }I>0
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