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I'm trying to deal a problem using this formula, but I'm unclear as to what dl represents (Or if it is the same as dx in most integrals, then in that case I don't know what the lowercase L is)
[tex]{\cal{E}} = \int_{a}^{b} \vec{E} \cdot \vec{dl}[/tex]
[tex]{\cal{E}} = \int_{a}^{b} \vec{E} \cdot \vec{dl}[/tex]