Q1. Fill in the blanks.
i. An object that attracts materials like iron, nickel and cobalt is called a____________.
ii. A magnet has two poles –________Pole and ________Pole.
iii. Magnetite is a ______________magnet.
iv. A ____________can be used to find directions.
v. _________________magnets retain their properties only for a short period of time.
i. A cylindrical magnet has only one pole. _______
ii. The force of attraction of magnet is maximum at the poles and minimum at the centre. _________
iii. Plastic is a magnetic material. ________
iv. The earth behaves like a giant magnet. ________
v. We can make magnet with single pole. _______
Q3. Who discovered magnets?
Q4. Where are poles of a bar magnet located?
Q5. Where on a magnet is the magnetic force the maximum?
Q6. How a mixture of iron fillings and sand is separated?
Q7. Where on a magnet is the magnetic force the minimum?
Q8. In which direction a freely suspended magnet come to rest?
Q9. What happen when we bring magnetic compass near a closed electric circuit?
Q10. Name the two poles of a magnet.
Q11. If magnet is not attracting the iron nails. What could be the reason behind this?
Q12. What happens when a south pole of a magnet is brought near the south pole of another magnet?
Q13. How can a magnet be demagnetized?
Q14. How can you tell whether a particular substance is magnetic or non-magnetic?
Q15. Why should we not keep magnets near mobiles, television, computers and CD?
Q16. Why a magnet is called a "magnetic dipole”?
Q17. What are electromagnets?
Q18. If a bar magnet broke into pieces, then where will its North and South Pole?
Q19. How do magnets lose their properties?