Assertion : In an electromagnetic wave, the elecric field E is much larger than magnetic field B.
Reason : The electromagnetic waves get deflected in perpendicular electric field but not in a perpendicular magenetic field

Options

A. If both assertion and reason are true and\ reason is a correct explanation of the assertion
B. If both assertion and reason are true but the reason is not a correct explanation of assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true

Answer

To solve the problem, we need to analyze the assertion and the reason given in the question step by step.

### Step 1: Analyze the Assertion
The assertion states: "In an electromagnetic wave, the electric field E is much larger than the magnetic field B."

- **Understanding the Relationship**: In electromagnetic waves, the electric field (E) and the magnetic field (B) are related through the speed of light (c). The relationship is given by the equation:
\[ c = \frac{E}{B} \]
where \( c \) is the speed of light (approximately \( 3 \times 10^8 \, \text{m/s} \)).

- **Magnitude Comparison**: From the above relationship, we can express the electric field in terms of the magnetic field:
\[ E = cB \]
This indicates that the electric field is indeed much larger than the magnetic field because \( c \) (the speed of light) is a very large number.

- **Conclusion for Assertion**: Therefore, the assertion is **true**.

### Step 2: Analyze the Reason
The reason states: "The electromagnetic waves get deflected in a perpendicular electric field but not in a perpendicular magnetic field."

- **Understanding Deflection**: Electromagnetic waves can be affected by electric and magnetic fields. When an electromagnetic wave travels through a medium with an electric field, it can experience a force due to the electric field, which can result in deflection.

- **Magnetic Field Interaction**: However, electromagnetic waves are not deflected by magnetic fields in the same way. While charged particles can be deflected by magnetic fields, the waves themselves do not experience a force that leads to deflection in the same manner.

- **Conclusion for Reason**: Therefore, the reason is **false**.

### Final Conclusion
- **Assertion**: True
- **Reason**: False

Thus, the correct answer is that the assertion is true, but the reason is false.

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