Homework Answers
Let x is the point from 16.4nC charge where total potential will be zero due to these charges.
Electrical Potential = kq/r
Electrical Potential due to charge 16.4nC = 9×10^9 × 16.4×10^-9/x = 147.6/x
Electrical potential due to charge -6.9nC = -6.9×9/(15.6-x) = -62.1/(15.6-x)
Total electrical potential = 147.6/x - 62.1/(15.6-x) = 0
37.07 - 2.3768x = x
x = 10.977 cm
Electrical field due to these charges at that point = 147.6/(10.977×10^-2)^2 + 62.1/(4.622×10^-2)^2
Electrical field = 4.13×10^4 N/C
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