Suppose a uniform electric field of 4 N/C is in the positive x direction. When a charge is placed at and fixed to the origin, the resulting electric field on the x axis at x = 2 m becomes zero. What is the magnitude of the electric field at x = 4 m on the x axis at this time?
A. 0
B. 1 N/C
C. 2 N/C
D. 4 N/C
E. More information is needed to find the resulting field magnitude at this position.
Answer: C
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