Page 129 - Physics_Form_2

Magnetism

Explain how you can determine
which bar is a strong permanent
magnet. P Q
14. Bar magnet P is twice as strong as 1 m
bar magnet Q.
FOR ONLINE READING ONLY
(a) The two magnets are arranged
with the N-pole of P 1m from Figure 3.61
the S-pole of Q as shown in Is there a neutral point between the
Figure 3.59. two magnets? If there is, how far
is it from magnet P? If there is no
P Q neutral point, explain why.
1 m
16. Copy the image of a horseshoe
magnet shown in Figure 3.62 and
Figure 3.59 sketch 8 to 10 field lines.

Is there a neutral point between
the two magnets? If there is,
how far from magnet P is it
located? If there is no neutral
point, explain why.

(b) Magnet Q in Figure 3.59 is Figure 3.62
flipped so that the two north 17. Compasses designed to be used in
poles are 1 m apart as shown cars are equipped with a suction cup
in Figure 3.60. so that they can be mounted on the
dashboard. Why?
P Q 18. Suppose that in Figure 3.63 (a) the
1 m nail becomes magnetised, with the
head of the nail becoming a north
magnetic pole. What could happen if
Figure 3.60 the battery was reversed as in Figure

Is there a neutral point between 3.63 (b)?
the two magnets? If there is,
how far from magnet P is it
located? If there is no neutral
point, explain why not.

15. The two magnets described in
Question 14 are placed parallel to (a) (b)
each other as shown in Figure 3.61.
Figure 3.63

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