Question 65

From the field line diagram, the number of lines originating from $Q_1$ is greater than the number of lines terminating at $Q_2$. Since the magnitude of the charge is proportional to the number of field lines, $|Q_1| > |Q_2|$. This makes option A correct. The lines originate from $Q_1$ and terminate at $Q_2$, meaning $Q_1$ is positive and $Q_2$ is negative. For a system of two opposite charges of unequal magnitude, the null point (where the electric field is zero) exists on the line joining them, outside the charges, specifically on the side of the charge with the smaller magnitude. Since $|Q_2| < |Q_1|$, the null point will be to the right of $Q_2$ at a finite distance. Thus, option D is correct.