Q76 / 120 · NEET 2010 (Mains) · Physics

Two identical bar magnets are fixed with their centres at a distance $d$ apart. A stationary charge $Q$ is placed at $P$ in between the gap of the two magnets at a distance $D$ from the centre $O$ as shown in the figure Figure
The force on the charge $Q$ is

  • Correct answer
    A
    zero
  • B
    directed along $O P$
  • C
    directed along $P O$
  • D
    directed perpendicular to the plane of paper

Solution

The force of attraction on $Q$ by the north pole of first magnet is $F$. The force of attraction on the same charge by $n$ the north pole of another magnet must be opposite to that of the first magnet. Thus, they concel the effect of one other and hence force on the charge $Q$ is zero.

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

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