A circular coil of radius 3cm has 50 turns. It is placed on the horizontal plane and a current of 3A flows through it in clockwise direction as seen from above. Calculate the magnetic field at a point on the axis of the coil, at a distance of 4cm from its centre. Also indicate the direction of the magnetic field.

Explanation

To solve the problem of finding the magnetic field at a point on the axis of a circular coil, we will follow these steps:

### Step 1: Identify the given values
- Radius of the coil, \( r = 3 \, \text{cm} = 3 \times 10^{-2} \, \text{m} \)
- Number of turns, \( n = 50 \)
- Current flowing through the coil, \( i = 3 \, \text{A} \)
- Distance from the center of the coil to the point of interest on the axis, \( x = 4 \, \text{cm} = 4 \times 10^{-2} \, \text{m} \)

...