Question

What is the net force experienced by a bar magnet placed in a uniform magnetic field?
A) Zero
B) Depends upon the length of the magnet
C) Never zero
D) Depends upon temperature

Answer 1

Hint : The space around the poles of a magnet is called the magnetic field, and is represented by magnetic lines of force. The force exerted on one magnet by another one, either of attraction or of repulsion is called the magnetic field. According to Coulomb's first law, unlike poles attract each other and like poles repel each other.

Complete step-by-step solution:
A magnetic material exhibits a magnetic field around itself. This field can be visualized in front of lines originating from the north pole of the magnet and ending at the South Pole .These hypothetical lines are called magnetic field lines.

A bar magnet which consists of two equal and opposite magnetic poles separated by a small distance.
When a bar magnet is placed in a uniform magnetic field then two poles of the bar magnet experience equal and opposite forces. The force which is at one end nullifies the force at the other end. Hence the net force experienced by a bar magnet is zero.
So the correct option is A.

Note: Students magnetic lines of force which originate from a north pole and end at south pole and there cannot exist an isolated north pole or south pole. Magnetic monopoles do not exist in nature. Earth which produces its own magnetic field. Tesla is a unit of magnetic field strength (magnetic flux density).