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  4. 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. The force on the charge Q is <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/kmhriscavftg-q.jpeg />

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Q. 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. The force on the charge $Q$ is
image

AIPMTAIPMT 2010Magnetism and Matter

Solution:

Magnetic field due to bar magnets exerts force on moving charges only. Since the charge is at rest, zero force acts on it.