Question

Two charges $+Q$ and $-2Q$ are located at points $A$ and $B$ on a horizontal line as shown in the figure.
The electric field is zero at a point which is located at a finite distance :

• A. on the perpendicular bisector of $AB$
• B. left of $A$ on the line
• C. between $A$ and $B$ on the line
• D. right of $B$ on the line

Answer 1

Answer: (B)

left of $A$ on the line

The point must be located at the left of A. $E_1$ is electric field by Q will be toward left and $E_2$ by -2Q will be toward right.