Question

Identify the cases in which magnetic force is acting between the two bodies.

• A. A magnet is kept at a small distance from an iron rod.
• B. North pole of a magnet is kept in touch with south pole of another magnet.
• C. North pole of a magnet is kept at a small distance from north pole of another magnet.
• D. A magnet is kept in contact with a non-magnetic piece of wood.

Answer 1

Answer: (A), (B), (C)

The correct options are
A A magnet is kept at a small distance from an iron rod.
B North pole of a magnet is kept in touch with south pole of another magnet.
C North pole of a magnet is kept at a small distance from north pole of another magnet.

Magnetic force acts between two magnetic objects, when they are in contact as well as when they are not in contact with each other.
Since iron rod is a magnetic material, magnetic force acts between the iron rod and the magnet.
Magnetic force also acts between two poles of a magnet (Like poles repel and unlike poles attract).
Since wood is a non-magnetic material, magnetic force do not act between a piece of wood and a magnet.