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Standard XII
Physics
Question
If c is the speed of electromagnetic waves in vacuum, its speed in a medium of dielectric constant k and relative permeability
μ
r
i
s
v
=
1
√
μ
r
k
v
=
c
√
μ
r
k
v
=
c
√
μ
r
k
v
=
k
√
μ
r
C
A
v
=
c
√
μ
r
k
B
v
=
k
√
μ
r
C
C
v
=
1
√
μ
r
k
D
v
=
c
√
μ
r
k
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Solution
Verified by Toppr
Speed of light of vacuum
c
=
1
√
μ
0
ε
0
.
.
.
.
.
(
1
)
And in another medium
v
=
1
√
μ
v
.
.
.
(
2
)
μ
r
=
μ
μ
0
,
ϵ
r
=
ϵ
ϵ
0
=
k
Dividing by equation
(
1
)
&
(
2
)
c
v
=
√
μ
ϵ
√
ϵ
0
μ
0
=
√
(
μ
μ
0
)
ϵ
ϵ
0
=
√
μ
r
k
c
v
=
√
μ
r
k
v
=
c
√
μ
r
k
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