U shaped magnet: One metal plate is placed across the two poles of the U shaped magnet.
Bar magnet: Bar magnets should be kept in pairs with opposite poles on the same side. Use two metal plates and one wooden block, arrange them as shown in the figure.
Will the two pieces act as individual magnets? Mark the poles of these two pieces. What will happen if these magnets are further broken?
What inference could he draw from this observation? Explain. 
Will the two magnets attract or repel each other? Why?