II. Give Reasons:
Magnets should be kept away from mobiles, TV and music systems.
Magnets should be stored in magnetic keepers.
Magnetic compass is used for navigation.
Repulsion is the sure test for magnetism.
What will happen if you place two bar magnets of exactly the same size one above the other such that their north poles are on the same side ? Explain your observation .
An iron bar A is attracted by a magnet on one end but repelled at the other end. Another iron bar B is attracted by the magnet on both its ends. Which of the two iron bars A or B, could be a magnet ? Give reasons.
Answers
Answer:
Explanation:
magnets should be kept away from devices which work with the help of magnets like TV and music systems because the magnetic fields produced by these devices can demagnetise your magnet.
Magnet keepers protect your magnets from external magnetic fields and hence prevent them from getting demagnetized.
Magnetic compass responds to the earth's magnetic field by producing a deflection that points towards the geographic north. Hence, it is used in navigation.
Since we also have gravitational force which is attractive in nature, hence, repulsion is the sure test of magnetism.
They would together behave as a bigger magnet as their magnetic moments would add up.
A is a magnet as it is attracted by the like pole and repelled by the unlike pole whereas B is an iron bar as it is attracted by both the poles.