An infinite wire havving charge density `lamda=10` n C/m is moving along its axis with speed 100 m/s. Find magnetic field at a distance 4 cm perpenducular to wire.

Explanation

To find the magnetic field at a distance of 4 cm from an infinite wire with a given charge density that is moving, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Given Values**:
- Charge density, \( \lambda = 10 \, \text{nC/m} = 10 \times 10^{-9} \, \text{C/m} \)
- Speed of the wire, \( v = 100 \, \text{m/s} \)
- Distance from the wire, \( d = 4 \, \text{cm} = 4 \times 10^{-2} \, \text{m} \)
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