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-in trng lmt dng vt cht c bit tn ti xung quanh cc in tch gi vai tr lc tng tc tnh in t in tch ny sang in tch khc-t 1 in tch q0 ti 1 im m trong in trng, in tch q s dt tc dng lc F
* khng ph thuc qo ch ph thuc v tr im M
*(E gi l vecto cng in trng)