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Question:

A few electric field lines for a system of two charges Q1 and Q2 fixed at two different points on the x-axis are shown in the figure. These lines suggest that |Q1| > |Q2|, at a finite distance to the right of Q2, the electric field is zero, and at a finite distance to the left of Q1, the electric field is zero. |Q1| < |Q2|

|Q1|>|Q2|

at a finite distance to the left ofQ1,the electric field is zero

|Q1|<|Q2|

at a finite distance to the right ofQ2,the electric field is zero

Solution:

Number of Electric field lines emerging from Q1 are more than the number of lines terminating at Q2. So, Q1 is a positive charge of higher magnitude and Q2 is a negative charge of smaller magnitude. Hence, the point at which the electric field is zero is on the right of the negative charge Q2