1a. Two point particles, with the same charge, are located at twovertices of an

Question

1a. Two point particles, with the same charge, are located at twovertices of an equilateral triangle. A third charged particle isplaced so the electric field at the third vertex is zero. The thirdparticle must: be on theperpendicular bisector of the line joining the first twocharges
be on the linejoining the first two charges
have charge of thesame magnitude as the first two charges but its charge may have adifferent sign
have the samecharge as the first two particles
be at the centerof the triangle 1b. Experimenter A uses a test charge q0 andexperimenter B uses a test charge -2q0 to measure anelectric field produced by stationary charges. A finds a field thatis: less in magnitudethan the field found by B
the same in bothmagnitude and direction as the field found by B
opposite indirection to the field found by B
greater inmagnitude than the field found by B
either greater orless than the field found by B, depending on the accelerations ofthe test charges (Answer: For 1b I would have chosen b if the test charge was just2q0 . But kind of confuse with the -2q0)


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Explanation / Answer

1a. Two point particles, with the same charge, are located at twovertices of an equilateral triangle. A third charged particle isplaced so the electric field at the third vertex is zero. The thirdparticle must:

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