Concept:Magnetic field lines emerge from the north pole and enter the south pole outside a magnet, and they never intersect each other.Explanation:When two bar magnets are placed with unlike poles close together, the field lines between them run continuously from the north pole of one magnet to the south pole of the other.The correct diagram must show smooth, unbroken curves with arrows directed from N to S.The lines should not cross and should be evenly spread near the poles.Among the given diagrams, Diagram III correctly represents this magnetic field pattern.Answer:C. III
