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Question

Assertion :The velocity of electromagnetic waves depends on electric and magnetic properties of the medium. Reason: Velocity of electromagnetic waves in free space is constant.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Assertion:
The velocity of the electromagnetic wave depends on the electric and magnetic properties and is given by:
v=1μ0ε0
It shows that the speed of the EM waves depends on the magnetic field as well as the electric field in the medium.

Reason:
The velocity of the electromagnetic waves in free space is constant and is equal to the speed of light.

The assertion and reason bot are correct but this Reason not a proper explanation of Assertion. Option (B) is correct.

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