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Magnetism
permeable. Suppose a region is Field lines follow
to be shielded from magnetic
effects; it could be enclosed
with a ring made up of soft
iron. The field lines could
follow the iron ring around the The iron ring
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shielded region as shown in
Figure 3.38. Figure 3.38: Magnetic shielding redirects field lines
Activity 3.9
Aim: To demonstrate magnetic shielding
Materials: two pencils, bar magnets, index cards, sellotape, paper clips, drinking straws,
iron nails
Procedure
1. Place two pencils on the sides of an index card.
2. Lay a second index card on top of the pencils as shown in Figure 3.39.
Side view End view
Figure 3.39
3. Tape a strong bar magnet to the top index card as shown in 3.40.
Top view End view
Figure 3.40
4. Use the assembly to pick up several small paper clips with the bottom card as
shown in Figure 3.41.
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