Q4 of 7 Page 42

Give reasons.

If a bar magnet is suspended vertically it does not hang in the north-south direction.

A bar magnet has property to come at rest at north-south direction or orient itself such that north pole of magnet poles toward north pole of earth and south pole of magnet toward south pole of earth but this happens if magnet is allowed to swing freely along Horizontal Surface of earth, when a bar magnet is suspended vertically, it is not allowed to move freely in Vertical Plane of earth as Gravitational force is acting on magnet and it can’t swing freely so as to so it is not hang in north –south direction.


More from this chapter

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2

Match the following.

 3

Fill in the blanks.

(a) There is magnetic …….………. between like poles.


(b) Stainless steel is a …….………. substance.


(c) There is mutual attraction between …….………. poles of magnets.


(d) There is maximum magnetic force near the …………… of a magnet.

 4

Give reasons.

A magnetic needle is used in a mariner's compass.

 1

Take a paper clip. Tie a fine black thread to it. Tie a knot to the other end of the thread and stick it to a table top. Now, bring a bar magnet above the clip. The magnet will lift the clip. Keep raising the bar magnet gradually. The clip, too, will rise till the thread becomes straight. If the magnet were hidden what would you see ? A clip that hangs in mid-air !