A student attempts to sketch magnetic field lines around a bar magnet but makes…
PHYSICS · Multi-part · AP · Physics 2: Algebra-based · Magnetism and Electromagnetism · Magnetism and Electromagnetism
Problem
A student attempts to sketch magnetic field lines around a bar magnet but makes several mistakes. Carefully study the description of the student’s sketch and answer the following questions.
(i) The diagram shows five magnetic field lines emerging from the north pole but only three entering the south pole. Identify and correct this error.
(ii) Two of the magnetic field lines intersect each other at a point. Explain why this is incorrect.
(iii) All arrows on the field lines have been drawn pointing from the south pole to the north pole. State the correct direction of magnetic field lines and justify your answer.
(iv) The density of field lines near the centre of the magnet is depicted as the same as that at the poles. Explain why this representation is unsatisfactory and state where the magnetic field of a bar magnet is strongest.