O-LevelPhysicsMagnetism5054/11 · Oct/Nov 2012 · Q331 Mark
Each of the diagrams shows a cross-section through two parallel, current-carrying conductors. Which diagram shows the shape of the magnetic field pattern and the directions of the forces on the two conductors?
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Adiagram with two conductors both marked with a 'cross' (current into page). Magnetic field lines are concentric ellipses around both. Force arrows on conductors point outwards, indicating repulsion.
Bdiagram with two conductors both marked with a 'cross' (current into page). Magnetic field lines are concentric ellipses around both. Force arrows on conductors point inwards, indicating attraction.
Cdiagram with a left conductor marked 'cross' (current into page) and a right conductor marked 'dot' (current out of page). Magnetic field lines are concentric ellipses around both. Force arrows on conductors point inwards, indicating attraction.
Ddiagram with a left conductor marked 'cross' (current into page) and a right conductor marked 'dot' (current out of page). Magnetic field lines are concentric ellipses around both. Force arrows on conductors point outwards, indicating repulsion.
✓ Correct answer
C: diagram with a left conductor marked 'cross' (current into page) and a right conductor marked 'dot' (current out of page). Magnetic field lines are concentric ellipses around both. Force arrows on conductors point inwards, indicating attraction.
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