What is the difference between magnetic length and length of magnet ?

Explanation

To understand the difference between magnetic length and length of a magnet, we can break it down into the following steps:

### Step 1: Define Magnetic Length
Magnetic length is defined as the distance between the North Pole and the South Pole of a magnet. It represents the effective length over which the magnetic field is concentrated.

### Step 2: Visualize Magnetic Length
Consider a permanent bar magnet. If we denote the North Pole as point N and the South Pole as point S, the magnetic length (denoted as \( L_m \)) is simply the straight-line distance from point N to point S.

...