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