Final answer:
The student's question refers to identifying evidence of a compass used to map magnetic fields, which could be depicted with concentric circular lines around a central point or by showing a needle pointing towards magnetic north.
Step-by-step explanation:
The question pertains to identifying which part of a figure shows evidence of the use of a compass. A compass in physics refers to a magnetic compass used for navigation or for plotting and understanding magnetic fields, not to be confused with a drawing compass used in geometry. In the given context, small compasses could be used to map out magnetic fields around a current-carrying wire or magnetic sources such as magnets. If the figure in question illustrates magnetic field lines that are circular and concentric around a central point (as in a circular current loop or around a magnet), this is indicative of the use of a magnetic compass for plotting these field lines.
Furthermore, when moving a compass in a circular plane around a magnet, the way the compass needle aligns will reveal the direction of the magnetic field, which is tangent to the field lines at any given point. If the figure shows field lines that consistently align with what would be expected from such observations, this would be evidence of the use of a compass. Additionally, a compass needle will point in the direction of the Earth's magnetic north when used to indicate the direction of a magnetic field, which can also be represented in diagrams that display magnetic fields.