C. Short Type Questions 1. What is demagnetisation? 2. How isa magnetic compass useful to the sailors? 3. What are magifetic and non-magnetic substances? Give two examples of each. 4. Why do we store magnets in keepers? 5. What will happen if a magnet breaks?
Answers
Answer:
1) to lose magnetic properties or remove magnetic properties (2) The magnetic compass was an important advance in navigation because it allowed mariners to determine their direction even if clouds obscured their usual astronomical cues such as the North Star. It uses a magnetic needle that can turn freely so that it always points to the north pole of the Earth's magnetic field. (3) Magnetic substances means which are attracted towards magnet Ex Steel, Cobal, Iron etc and non-magnetic substances are not attracted towards magnet Ex -Wood, Plastic, Gold etc (4) Magnets become weaker with time (due to 'free' poles) near the ends repelling each other and upsetting alignment of tiny magnets). To prevent this bar magnets are stored in pairs with unlike poles opposite and pieces of soft iron - keepers across the ends.(5) If you cut one in half, the newly cut faces will become the new north or south poles of the smaller pieces.
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