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For questions that utilize the concept of electric fields (commonly denoted by the letter E), or for questions whose answers likely involve electric fields. More specific than the [electricity] tag, as questions about the phenomenon & theory of electricity do not necessarily involve the discussion of fields.
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Forces and magnetic lines of force
Lines of forces are applicable to electric field , magnetic field , gravitational field (notice the word "field"). They do not have any physical significance means nothing mathematical. But it does ha …