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(A) diamagnetic material is weakly repelled by a magnetic field. It tends to move from regions of stronger magnetic field to regions of weaker magneti

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around regions such as $A$

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(A) diamagnetic material is weakly repelled by a magnetic field. It tends to move from regions of stronger magnetic field to regions of weaker magnetic field.In the given array of wires,the magnetic field produced by adjacent wires with opposite current directions cancels out at the midpoint between them (region $A$).Since the magnetic field is minimum (zero) at region $A$ and maximum near the wires (region $B$),the diamagnetic particles will experience a force pushing them away from the high-field regions towards the low-field region $A$.Therefore,the diamagnetic particles will accumulate in the regions where the magnetic field is weakest,which is region $A$.

Consider the regular array of vertical identical current-carrying wires (with the direction of current flow as indicated in the figure alongside) protruding through a horizontal table. If we scatter some diamagnetic particles on the table,then they are likely to accumulate:

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