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UM L4 Movie 1: Compass and four rubbed nails with the same orientation

UM L4 Movie 2: Compass and four rubbed nails again, with two nails turned around

UM L4 Movie 3: Paper clips and ten bar magnets, all with the same orientation

UM L4 Movie 4: Paper clips and ten bar magnets again, with five magnets turned around

UM L4 Movie 5: Simulation of combinations of magnets with different (horizontal) orientations

UM L4 Movie 6: Simulation of magnets pointing in random directions

UM L4 Movie 7: Simulation of bar magnet dragged past magnet on a pivot