NEET Physics Applications of EM Waves MCQ Question
If the speed of an electromagnetic wave is given by c = 1/√(ε₀μ₀), which of the following correctly describes what happens to the wave speed when the permittivity ε₀ is doubled and permeability μ₀ is halved?
The speed remains unchanged.
The speed is halved.
The speed is doubled.
The speed increases by a factor of √2.
Correct Answer
Detailed Explanation
From the relation c = 1/√(ε₀μ₀), doubling ε₀ and halving μ₀ results in the same value for c, hence the speed remains unchanged.
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