The electric field lines are shown for a system of two point charges. Which of the following could represent the magnitudes and signs of QA and QB? In the following, take q to be a positive quantity.
a) QA = +q, QB = −q
b) QA = +7q, QB = −3q
c) QA = +3q, QB = −7q
d) QA = −3q, QB = +7q B
e) QA = −7q, QB = +3q
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