Acompass in a magnetic field will line up
(a) with the north pole pointing perpendicular to the magnetic field
(b) with the north pole pointing opposite the direction of the magnetic field
(c) with the north pole pointing in the direction of the magnetic field

Option c

Explanation:

Magnetic field lines form loops starting from north pole to south pole outside the magnet and from south pole to north pole inside the magnet.

Thus the field is such that it is directed outwards from the North pole and directed inwards to the South pole of the magnet.

A compass in a magnetic field will will comply with the magnet's North pole directing towards the magnetic field.

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