Question

Which of the following is/are true about magnets?
This question has multiple correct options
A) Magnets always have two poles
B) Magnetic monopoles do not exist
C) The most powerful magnet in the universe is actually a star called a magnetar
D) Both A and B

Answer 1

Hint: Magnets always have a north pole and a south pole and no pole can exist individually. We will use this principle of magnets to determine the correct options from the options given in the question.

Complete answer:
We know that magnets always exist in pairs of North and South poles. We can observe such magnets in a compass where the North pole and the South pole of the magnet compass align themselves with the magnetic South and the North pole of the Earth respectively because opposite magnetic poles attract each other so option (A) is correct.
From the above explanation, we can also conclude that the magnetic monopoles i.e. single magnetic pole does not exist since magnets always have two poles which are conventionally named as North and South pole. To this date, magnetic monopoles have not been discovered anywhere to exist.
It is a known fact that the most powerful magnet in the universe is actually a star which is also called a magnetar. Magnetars are neutron stars. They can have magnetic fields of up to Teslas which is quite high compared to the magnetic fields of any other kind of object in the universe. So, option (C) is also correct.
Hence the correct choices are options (A), (B), and (C).

Note:
Knowing that either option (A) or option (B) is correct should automatically confirm the other statement since both the statements state the magnets always have two poles and no magnet can have just a monopole. Since option (C) is also correct, we can discard option (D) which says both (A) and (B) is correct but does not mention anything about option (C).