Q.

If c is the speed of electromagnetic waves in vacuum, its speed  v in a medium of dielectric constant K and relative permeability μr is (c is the speed of light)

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a

v=1μrK

b

v=cμrK

c

v=cμrK

d

v=Kμrc

answer is C.

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Detailed Solution

Speed of light in vacuum, c=1μ0ε0 and in another medium v=1μεcv=μεμ0ε0=μrK⇒v=cμrK
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If c is the speed of electromagnetic waves in vacuum, its speed  v in a medium of dielectric constant K and relative permeability μr is (c is the speed of light)