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Neutral Point in Electric Field

A neutral point is a point where the resultant electrical field is zero.
 
Neutral point due to a system of two like point charges For this case neutral point is obtained at an internal point along the line joining two like charges.
 
If N is the neutral point at a distance x1 from Q1 and at a distance x2(= xx1) from Q2 (Fig. 13), then at N
 
39785.png
Fig. 13
 
|E.F. due to Q1| = |E.F. due to Q2|
 
i.e., 37641.png 37647.png
 
Neutral point due to a system of two unlike point charges For this condition neutral point lies at an external point along the line joining two unlike charges. Suppose two unlike charge Q1 and Q2 are separated by a distance x from each other. Here neutral point lies outside the line joining two unlike charges and also it lies nearer to the charge which is smaller in magnitude (Fig. 14).
 
37951.png
Fig. 14
 
If 37653.png, then neutral point will be obtained on the side of Q1; suppose it is at a distance l from Q1, so
37659.png




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