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तीन आवेश -q, +q तथा +q क्रमशः x-y तल...

तीन आवेश `-q, +q` तथा `+q` क्रमशः x-y तल में `(0, -a), (0, 0)` तथा `(0, a)` बिन्दुओं पर स्थित हैं | अक्ष से `theta` कोण बनाने वाली रेखा पर r दुरी पर सिद्ध कीजिए कि विभव V निम्न होगा -
`V=(1)/(4pi in_(0))((q)/(r )+(2qa cos)/(r^(2))), r gt gt a`

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