Two point charges Q and ` - Q //4` are separated by a distance ` X`. Then
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A. potential is zero at point on the axis which is `x//3` on the right side of the charge `-Q//4`
B. potential is zero at point on the axis which is `x//5` on the right side of the charge `-Q//4`
C. electric fiels is zero at a point on the axis which is at a distance `x` on the right side of the charge `-Q//4`
D. there exist two points on the axis where electric field is zero .
