Explanation
If the angle between all forces which are equal and lying in one plane are equal then resultant force will be zero.
Displacement, electric field and acceleration are vector quantities.
For 17 N both the vector should be parallel i.e., angle between them should be zero.
For 7 N both the vectors should be antiparallel 1.e., angle between them should be 180
For 13 N both the vectors should be perpendicular to each other i.e., angle between them should he 90.
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