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

• A

  on the perpendicular bisector of $\mathrm{AB}$
• Correct answer
  B

  left of $\mathrm{A}$ on the line
• C

  between $\mathrm{A}$ and $\mathrm{B}$ on the line
• D

  right of $\mathrm{B}$ on the line

Hence, the correct answer is option: 'B'.