A solenoid 50 cm long has 4 layers of windings of 350 turns each. If the current carried is 6 A, find the magnetic field at the centre of the solenoid.

Explanation

To find the magnetic field at the center of the solenoid, we can follow these steps:

### Step 1: Determine the total number of turns (N)
The solenoid has 4 layers of windings, with each layer containing 350 turns. Therefore, the total number of turns (N) can be calculated as:

\[ N = \text{Number of layers} \times \text{Turns per layer} = 4 \times 350 = 1400 \text{ turns} \]
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