Point charges and are fixed apart in a vacuum. At a point on the line through them, outside the segment between them, the resultant electric field is zero. How far is this point from the charge, in metres?
Answer and explanation
Correct answer: D. 0.30
- Step 1: Outside the two opposite charges along their line, the point of zero resultant field must lie closer to the smaller magnitude charge . Let this distance be .
- Step 2: Equate the magnitudes of electric fields: .
- Step 3: Take square roots: .
Answer
0.30.
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