E. Give reasons for the following statements.
1. At the north pole the magnetic compass needle does not orient itself in a particular direction
horizontally.
2. A freely suspended magnet need not be horizontal, it could be tilted upward or downward.
3. North pole cannot be separated from the south pole.
4. An object which is repelled by a magnet has to be another magnet.
5. The best way to separate sand and iron filings would be magnetic separation.
Answers
Answer:
1) At north pole the vertical component of earth's field will exert torque on the magnetic needle so as to align it along its direction. As the compass needle can not rotate in vertical plane, it will rest horizontally, when placed on the magnetic north pole of the earth.
3)Further experimentation shows that it is impossible to separate north and south poles in the manner that + and − charges can be separated. ... One end of a bar magnet is suspended from a thread that points toward north. The magnet's two poles are labeled N and S for north-seeking and south-seeking poles, respectively.
4) The magnetic field is the area around a magnet that has magnetic force. All magnets have north and south poles. Opposite poles are attracted to each other, while the same poles repel each other. When you rub a piece of iron along a magnet, the north-seeking poles of the atoms in the iron line up in the same direction.
5) Wrap a magnet in plastic lunch wrap and move it through the mixture of the three solids. The iron filings will stick to the magnet. The filings can be removed by unwrapping the plastic from the magnet carefully! Mix the remaining salt and sand in water and stir.