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Assertion : In an electromagnetic wave, ...

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

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

Text Solution

AI Generated Solution

The correct Answer is:
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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Knowledge Check

  • In an electromagnetic wave, electric field E and magnetic field B are

    A
    Mutually perpendicular to each other
    B
    bisect to each other
    C
    both (A) and (B)
    D
    none of these
  • The electric and magnetic field of an electromagnetic wave are

    A
    In opposite phase and perpendicular to each other
    B
    In opposite phase and parallel to each other
    C
    In phase and parallel to each other
    D
    In phase and parallel to each other
  • The electric and magnetic field of an electromagnetic wave are:

    A
    in opposite phase and perpendicular to each other
    B
    in opposite phase and parallel to each other
    C
    in phase and perpendicular to each other
    D
    in phase and parallel to each other.
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