In electromagnetic spectrum, the magnetic field and Electric field both are makes angle with direction of propagation of wave, is:

Options

A. `0^@`
B. `90^@`
C. `180^@`
D. `45^@`

Explanation

To solve the question regarding the angles that the electric field (E) and magnetic field (B) make with the direction of propagation of an electromagnetic wave, we can follow these steps:

### Step-by-Step Solution

1. **Understanding the Electromagnetic Wave Propagation**:
- In an electromagnetic wave, the electric field (E) and magnetic field (B) oscillate perpendicular to each other and also perpendicular to the direction of wave propagation.

2. **Defining the Axes**:
- Let's define a coordinate system:
- Assume the direction of wave propagation is along the x-axis.
- Let the electric field (E) be oriented along the y-axis.
- Consequently, the magnetic field (B) will be oriented along the z-axis.

3. **Using the Right-Hand Rule**:
- According to the right-hand rule, if you point your thumb in the direction of wave propagation (x-axis), your index finger in the direction of the electric field (y-axis), your middle finger will point in the direction of the magnetic field (z-axis). This confirms that E and B are perpendicular to each other and to the direction of propagation.

4. **Calculating the Angles**:
- The angle between the electric field (E) and the direction of propagation (x-axis) is 90 degrees.
- The angle between the magnetic field (B) and the direction of propagation (x-axis) is also 90 degrees.
- Therefore, both fields make an angle of 90 degrees with the direction of propagation of the wave.

5. **Conclusion**:
- Since both the electric field and magnetic field make an angle of 90 degrees with the direction of propagation, the correct answer to the question is 90 degrees.

### Final Answer:
The angle that both the electric field and magnetic field make with the direction of propagation of the wave is **90 degrees**.

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