Concept explainers
A wire is formed into a and the leads are twisted together. The sides of the loop are labeled A—D. The direction of the current is shown. (The diagram uses the convention that
1. On the top two diagrams at right, sketch magnetic field lines for the loop. Base your answer on your knowledge of the magnetic field of a current-carrying wire.
Explain why it is reasonable to ignore the effect of the magnetic field from the wire leads.
2. Consider the magnetic field of a bar magnet.
How are the magnetic field lines for the current loop similar to those for a short barmagnet?
Can you identify a “north” and a “south” pole for a current loop?
Devise a rule by which you can use your right hand to identify the magnetic poles of the loop from your knowledge of the direction of the current.
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