Draw magnetic field lines around a bar magnet.
To draw magnetic field lines around a bar magnet, place the magnet on a sheet of white paper and mark its boundary. Place a small compass near the north pole of the magnet. The south pole of the compass needle points towards the north pole of the magnet, while the north pole of the compass is directed away from it.
Mark the position of both ends of the needle. Move the compass so that its south pole occupies the position previously held by its north pole. Continue this process step by step until you reach the south pole of the magnet. Join all marked points with a smooth curve to form one field line. Repeat this procedure to draw multiple lines. The resulting pattern shows magnetic field lines emerging from the north pole and terminating at the south pole of the bar magnet.
Explanation
This answer is based on Activity 12.3 from the textbook, which describes the step-by-step procedure for drawing magnetic field lines using a compass. The context explains that the compass needle aligns along field lines, with its south pole pointing toward the magnet's north pole. The iron filings pattern in Fig. 12.2 also demonstrates how field lines appear around a bar magnet.
Solution Steps
Step 1: Place bar magnet on paper and mark its boundary.
Step 2: Place compass near north pole and mark needle positions.
Step 3: Move compass step by step towards south pole, marking positions.
Step 4: Join points with smooth curve to form a field line.
Step 5: Repeat to draw multiple field lines showing the complete pattern.