Two charges −qand +qare located at points (0, 0, −a)and (0, 0, a),

1.	Two charges −qand +qare located at points (0, 0, −a)and (0, 0, a),respectively.(a) What is the electrostatic potential at the points?(b) Obtainthe dependence of potential on the distance rof a point from the origin when r/a>> 1.(c) Howmuch work is done in moving a small test charge from the point (5, 0,0) to (−7, 0, 0) along the x-axis?Does the answer change if the path of the test charge between thesame points is not along the x-axis?
Answer» Two charges −q and +q are located at points (0, 0, − a) and (0, 0, a), respectively. (a) What is the electrostatic potential at the points? (b) Obtain the dependence of potential on the distance r of a point from the origin when r/a >> 1. (c) How much work is done in moving a small test charge from the point (5, 0, 0) to (−7, 0, 0) along the x-axis? Does the answer change if the path of the test charge between the same points is not along the x-axis?

Two charges −qand +qare located at points (0, 0, −a)and (0, 0, a),respectively.(a) What is the electrostatic potential at the points?(b) Obtainthe dependence of potential on the distance rof a point from the origin when r/a>> 1.(c) Howmuch work is done in moving a small test charge from the point (5, 0,0) to (−7, 0, 0) along the x-axis?Does the answer change if the path of the test charge between thesame points is not along the x-axis?

Answer»

Two charges −q
and +q
are located at points (0, 0, −
a)
and (0, 0, a),
respectively.

(a)
What is the electrostatic potential at the points?

(b) Obtain
the dependence of potential on the distance r
of a point from the origin when r/a
>> 1.

(c) How
much work is done in moving a small test charge from the point (5, 0,
0) to (−7, 0, 0) along the x-axis?
Does the answer change if the path of the test charge between the
same points is not along the x-axis?

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