Question

Which among these is not true for magnets?
A) When a bar magnet is cut into half, each half will have only one pole.
B) A magnet can be obtained from the iron in which all the electrons are spinning in the same direction.
C) Iron, Nickel, and Cobalt are the three elements of a magnet.
D) The earth acts as a huge magnet.

Answer 1

Magnet: A magnet is a piece of metal that attracts other metal objects strongly. A "magnetic field" is the attraction that a magnet creates. Magnets are found in many everyday things such as cassette cassettes, credit cards, toys, and compasses, and are made of iron or an iron alloy.

Complete step by step solution:
When a bar magnet is cut into half, each half will have only one pole: As we know when a bar magnet is cut into half they again generate two poles on both sides as was in their parent one. So, this option is an incorrect statement hence, this is the right answer.
A magnet can be obtained from the iron in which all the electrons are spinning in the same direction: So, this is also a correct statement if an element has an equal number of electrons rotate in both directions then it will neutralise its field.
Iron, Nickel, and Cobalt are the three elements of a magnet: This is a universal fact. All these are elements of a magnet; they will get attracted by a magnet.
The earth acts as a huge magnet: As we know molten lava is present in its benth so it act like a huge magnet.
Hence, our correct option is A.

Note:
Property of earth magnetism:
Magnets are attracted to ferromagnetic materials such as iron, cobalt, and nickel.
Magnetic poles with similar magnetic poles repel one another, while magnetic poles with opposite magnetic poles attract each other.
The directive property of a freely hanging magnet is that it always points north-south.