Point charges +1.0 μC and +4.0 μC are 0.30 m apart. At what distance from the +1.0 μC charge, on the line joining them, is the electric field zero?
Correct answer B. 0.10 m
Explanation
At the null point kq₁/x² = kq₂/(0.30 − x)². Taking square roots, x/(0.30 − x) = √(1/4) = 1/2, so x = 0.10 m, nearer the smaller charge.
Answer checked How we write and check questions
Discussion