Physics 2 Quiz
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ELECTRIC POTENTIAL
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A student calculates the electric potential at a point P due to two point charges +Q+Q at position AA and −2Q-2Q at position BB. Point P is such that ∣PA∣=r|PA| = r and ∣PB∣=2r|PB| = 2r.
The student correctly finds the potential at P, then argues: 'Since the total potential at P is negative, the electric field at P must point toward a region of higher (less negative) potential, which is the direction away from charge −2Q-2Q.' Is this reasoning valid, and what is the potential at P?
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