J. Diagram-based questions: N 1. Which of the given poles of magnets will repel each other? a a 2. Sohan has a small piece of metal and a thread. To find whether the piece is a magnet or not, he (a) requires a piece of magnetic substance, (b) requires a piece of non-magnetic substance. (c) requires a magnet or a compass. (d) does not require anything else.
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Answers
Answer:
When a magnet eg. bar magnet is suspended freely with a thread. Then it will always bends towards North pole i.e., it deflects towards North pole i.e, it deflects towards North pole. But a simple metal will not show any deflection. So, he will just take that metal piece and suspend it freely with a thread then it will not show any deflection this will give sure test that piece is not a magnet.
Diagram based questions:
1. North will repel from North and South will repel from South (because same pole repel each other whereas opposite poles attract each other)
2. C) requires a magnet or a compass. (because if the metal is magnetic, i.e made of iron or itself a magnet, then it would be attracted by the magnet. and if that metal is brought closer to the compass then the compass needle will show deflects but only if it's a magnet.)
3. The pieces of the broken magnet will act as two individual magnets. They will also have North Pole and South Pole. We can detect the poles of broken magnets by using compass of by the test of repulsion between newly formed magnets.
Hots Questions:
1. to tell which is north and which is south is by dangling your magnet from a string. When you dangle a magnet, it automatically turns itself so that one pole is pointing directly north and the other directly south, which is why we call them the “north” and “south” poles.
2. Bar magnets should be kept in pairs with their unlike poles on the same side because when we keep them in a pair (with unlike pairs on the same side) we are reducing the distance which in turn keeps the magnets strong.