(a)[3]
Show the arrangement of magnetic field lines around the bar magnet. Draw two lines above the magnet and two lines below it. Make sure each line begins and ends at a pole. Add one arrow to indicate the direction of the magnetic field.
(b)[2]
The student rubs a plastic rod with a dry cloth. The plastic rod becomes positively charged. Explain why friction between the plastic and the cloth makes the plastic rod positively charged.
(c)[2]
State whether the objects in Fig. 9.2 and Fig. 9.3 experience a force of attraction, a force of repulsion, or no force between them.