Two identical bar magnets are fixed with their centres at a distance d apart. A stationary charge Q is placed…

Magnetic force on a charge: $\vec{F} = Q(\vec{v}\times\vec{B})$
The charge is stationary, so v = 0.
$F = QvB\sin\theta = 0$, whatever the magnetic field at P due to the two magnets may be.
A magnetic field exerts a force only on a moving charge; a steady magnet produces no electric field to act on a charge at rest.
Hence the force on the charge Q is zero.