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=Kμrc

b

v=cμrK

c

v=1μrK

d

v=cμrK

answer is C.

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Detailed Solution

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Speed of light in vacuum, c=1μ0ε0 and in another medium v=1με

cv=μεμ0ε0=μrKv=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)