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Two point charges q1 = +2.40 nC and q2 = -6.50 nC are
Chapter 23, Problem 19E(choose chapter or problem)
Two point charges \(q_1=+2.40 \mathrm{nC}\) and \(q_2=\) \(-6.50 \mathrm{nC}\) are \(0.100 \mathrm{~m}\) apart. Point A is midway between them; point B is \(0.080 \mathrm{~m}\) from \(q_1\) and \(0.060 \mathrm{~m}\) from \(q_2\) (Fig. E23.19). Take the electric potential to be zero at infinity. Find
(a) the potential at point A;
(b) the potential at point B;
(c) the work done by the electric field on a charge of 2.50 nC that travels from point B to point A.
Questions & Answers
QUESTION:
Two point charges \(q_1=+2.40 \mathrm{nC}\) and \(q_2=\) \(-6.50 \mathrm{nC}\) are \(0.100 \mathrm{~m}\) apart. Point A is midway between them; point B is \(0.080 \mathrm{~m}\) from \(q_1\) and \(0.060 \mathrm{~m}\) from \(q_2\) (Fig. E23.19). Take the electric potential to be zero at infinity. Find
(a) the potential at point A;
(b) the potential at point B;
(c) the work done by the electric field on a charge of 2.50 nC that travels from point B to point A.
ANSWER:
Solution 19E Step 1: Potential at a point is defined as the amount of work done in bringing a unit positive charge from infinity to that point. Let the potential at point A be U and the potentaal at point B be U . be potential difference between the points is given by U ab U ab -b a Potential at a given point is given by U a,