BECE Science 2010 Paper

Concept:Magnetic lines of force around a bar magnet always move from the north pole to the south pole outside the magnet.Explanation:Outside a bar magnet, the direction of magnetic lines of force is always from $\mathrm{N}$ to $\mathrm{S}$.Inside the magnet, the lines continue from $\mathrm{S}$ to $\mathrm{N}$, forming closed loops.Look at each illustration and check the arrows drawn on the curved lines around the magnet.The correct diagram must show arrows starting at the end marked $\mathrm{N}$ and ending at the end marked $\mathrm{S}$.Any diagram showing arrows leaving $\mathrm{S}$ and moving toward $\mathrm{N}$ outside the magnet is incorrect.So, identify the figure in which the lines of force emerge from the north pole and enter the south pole.Answer:The correct illustration is the one that shows the arrows pointing from the north pole to the south pole outside the magnet.