A teacher asks students to suggest a method to demagnetise a magnet. Some responses are:
A) "dropping a magnet on floor several times"
B) "breaking the magnet into 2 halves"
C) "heating the magnet"
D) "throwing the magnet in water"
E) "by hammering it"
Which of the following are correct?
1
A, B and D
2
C, D and E
3
A, C and E
4
More than one of the above
5
None of the above