Consider a small cube of volume `1 mm ^3` at the centre of a circular loop of radius 10 cm carrying a current of 4 A. Find the magnetic energy stored inside the cube.

Explanation

To find the magnetic energy stored inside a small cube of volume \(1 \, \text{mm}^3\) at the center of a circular loop of radius \(10 \, \text{cm}\) carrying a current of \(4 \, \text{A}\), we can follow these steps:

### Step 1: Convert the volume of the cube to cubic meters
The volume of the cube is given as \(1 \, \text{mm}^3\). We need to convert this to cubic meters:
\[ 1 \, \text{mm}^3 = 1 \times 10^{-9} \, \text{m}^3 \]

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