A plane electromagnetic wave of frequency `25 Mhz` travels in free space along the x-direction. At a particular point in space and time, `E= (6.3 j) V//m`. What is `B` at this point?

Explanation

To find the magnetic field \( B \) at a point where the electric field \( E \) is given, we can use the relationship between the electric field and the magnetic field in an electromagnetic wave. The steps to solve the problem are as follows:

### Step-by-Step Solution:

1. **Identify the Given Values:**
- Frequency \( f = 25 \, \text{MHz} = 25 \times 10^6 \, \text{Hz} \)
- Electric field \( E = 6.3 \, \hat{j} \, \text{V/m} \)

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