Q20 of 20 Page 83

Suggest an arrangement to store a U shaped magnet. How is this different from storing a pair of bar magnets?

A U magnet is stored in a wooden box with a soft iron placed at the edge. A bar magnet is kept in pairs with opposite poles facing the same direction and separated by a wooden block. The two edges of the magnet are joined by soft iron bar.


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16


Fig. 13.6 shows a magnetic compass. What will happen to the position of its needle if you bring a bar magnet near it? Draw a diagram to show the effect on the needle on bringing the bar magnet near it. Also draw the diagram to show the effect when the other end of the bar magnet is brought near it.

 17

Suggest an activity to prepare a magnetic compass by using an iron needle and a bar magnet.

 18

Boojho kept a magnet close to an ordinary iron bar. He observed that the iron bar attracts a pin as shown in Fig. 13.7.

 19

A bar magnet is cut into two pieces A and B, from the middle, as shown in Fig. 13.8.


Will the two pieces act as individual magnets? Mark the poles of these two pieces. Suggest an activity to verify your answer.