Two point charges 
and 
are fixed on the X-axis at positions a and 2a from origin respectively. At what positions on the axis, the resultant electric field is zero
A
Only 
B
Only 
C
Both 
D
only
Text Solution
Verified by ExpertsThe correct answer is:
B
Suppose electric field is zero at a point P lies at a distance d from the charge + Q.
At P 
⇒ ⇒ 
⇒ ⇒ 
Since d > a i.e. point P must lies on negative x-axis as shown at a distance x from origin hence 
Actually P lies on negative x-axis so 
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