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    81.

    A radio wave of frequency 90 MHz enters a ferrite rod. If εr=103{\varepsilon _r} = {10^3} and μr=10{\mu _r} = 10, then the velocity and wavelength of the wave in ferrite are

    A

    3imes108  ms−1;3.33imes10−2  m3 imes {10^8}{\rm{\;m}}{{\rm{s}}^{ - 1}};3.33 imes {10^{ - 2}}{\rm{\;m}}

    B

    3imes106  ms−1;3.33imes10−2  m3 imes {10^6}{\rm{\;m}}{{\rm{s}}^{ - 1}};3.33 imes {10^{ - 2}}{\rm{\;m}}

    C

    3imes108  ms−1;3.33imes10−1  m3 imes {10^8}{\rm{\;m}}{{\rm{s}}^{ - 1}};3.33 imes {10^{ - 1}}{\rm{\;m}}

    D

    3imes107  ms−1;3.33imes10−3  m3 imes {10^7}{\rm{\;m}}{{\rm{s}}^{ - 1}};3.33 imes {10^{ - 3}}{\rm{\;m}}

    Question Tags

    📚 Subject:Physics
    📑 Chapter:Electromagnetic Waves
    🎯Topic:Electromagnetic Spectrum
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :electromagnetic wave propagation, relative permittivity, relative permeability, velocity of wave, wavelength
    82.

    According to Maxwell’s equation the velocity of light in any medium is expressed as

    A

    1μ0ε0\frac{1}{{\sqrt {{{\rm{\mu }}_0}{{\rm{\varepsilon }}_0}} }}

    B

    1με\frac{1}{{\sqrt {{\rm{\mu \varepsilon }}} }}

    C

    μ/ε\sqrt {{\rm{\mu }}/{\rm{\varepsilon }}}

    D

    μ0ε\sqrt {\frac{{{{\rm{\mu }}_0}}}{{\rm{\varepsilon }}}}

    Question Tags

    📚 Subject:Physics
    📑 Chapter:Electromagnetic Waves
    🎯Topic:Maxwell'S Equation, Displacement Current
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Maxwell's equations, speed of light, permittivity, permeability
    83.

    According to Maxwell’s equation the velocity of light in any medium is expressed as

    A

    1μ0ε0\frac{1}{{\sqrt {{{\rm{\mu }}_0}{{\rm{\varepsilon }}_0}} }}

    B

    1με\frac{1}{{\sqrt {{\rm{\mu \varepsilon }}} }}

    C

    μ/ε\sqrt {{\rm{\mu }}/{\rm{\varepsilon }}}

    D

    μ0ε\sqrt {\frac{{{{\rm{\mu }}_0}}}{{\rm{\varepsilon }}}}

    Question Tags

    📚 Subject:Physics
    📑 Chapter:Electromagnetic Waves
    🎯Topic:Maxwell'S Equation, Displacement Current
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Maxwell's equations, speed of light in a medium, permeability, permittivity
    84.

    If μ0{\mu _0} is permeability of free space and ε0{\varepsilon _0} is permittivity of free space, the speed of light in vacuum is given by

    A

    μ0ε0\sqrt {{\mu _0}{\varepsilon _0}}

    B

    μ0ε0\sqrt {\frac{{{\mu _0}}}{{{\varepsilon _0}}}}

    C

    1μ0ε0\sqrt {\frac{1}{{{\mu _0}{\varepsilon _0}}}}

    D

    ε0μ0\sqrt {\frac{{{\varepsilon _0}}}{{{\mu _0}}}}

    Question Tags

    📚 Subject:Physics
    📑 Chapter:Electromagnetic Waves
    🎯Topic:Maxwell'S Equation, Displacement Current
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :speed of light, permeability, permittivity
    85.

    If μ0{\mu _0} is permeability of free space and ε0{\varepsilon _0} is permittivity of free space, the speed of light in vacuum is given by

    A

    μ0ε0\sqrt {{\mu _0}{\varepsilon _0}}

    B

    μ0ε0\sqrt {\frac{{{\mu _0}}}{{{\varepsilon _0}}}}

    C

    1μ0ε0\sqrt {\frac{1}{{{\mu _0}{\varepsilon _0}}}}

    D

    ε0μ0\sqrt {\frac{{{\varepsilon _0}}}{{{\mu _0}}}}

    Question Tags

    📚 Subject:Physics
    📑 Chapter:Electromagnetic Waves
    🎯Topic:Maxwell'S Equation, Displacement Current
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :speed of light, permeability, permittivity
    86.

    If an electromagnetic wave is propagation in a medium with permeability ε{\rm{\varepsilon }} and permittivity μ{\rm{\mu }}, then με\sqrt {\frac{{\rm{\mu }}}{{\rm{\varepsilon }}}} is the

    A

    Intrinsic impedance of the medium

    B

    Square of the refractive index of the medium

    C

    Refractive index of the medium

    D

    Energy density of the medium

    Question Tags

    📚 Subject:Physics
    📑 Chapter:Electromagnetic Waves
    🎯Topic:Maxwell'S Equation, Displacement Current
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Electromagnetic waves, Intrinsic impedance, Permeability, Permittivity
    87.

    If an electromagnetic wave is propagation in a medium with permeability ε{\rm{\varepsilon }} and permittivity μ{\rm{\mu }}, then με\sqrt {\frac{{\rm{\mu }}}{{\rm{\varepsilon }}}} is the

    A

    Intrinsic impedance of the medium

    B

    Square of the refractive index of the medium

    C

    Refractive index of the medium

    D

    Energy density of the medium

    Question Tags

    📚 Subject:Physics
    📑 Chapter:Electromagnetic Waves
    🎯Topic:Maxwell'S Equation, Displacement Current
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Electromagnetic waves, Intrinsic impedance, Permeability, Permittivity
    88.

    If ε0  and  μ0{{\rm{\varepsilon }}_0}{\rm{\;and\;}}{{\rm{\mu }}_0} are the electric permittivity and magnetic permeability of free space and ε  and  μ{\rm{\varepsilon \;and\;\mu }} are the corresponding quantities in the medium, the index of refraction of the medium in terms of above parameter is

    A

    εμε0μ0\frac{{{\rm{\varepsilon \mu }}}}{{{{\rm{\varepsilon }}_0}{{\rm{\mu }}_0}}}

    B

    ${\left( {\frac{{{\rm{\varepsilon \mu }}}}{{{{\rm{\varepsilon }}_0}{{\rm{\mu }}_0}}}\begin{array}{*{20}{c}}

    {\rm{;}}\

    {\rm{;}}

    \end{array}} \right)^{1/2}}$

    C

    (ε0μ0εμ)\left( {\frac{{{{\rm{\varepsilon }}_0}{{\rm{\mu }}_0}}}{{{\rm{\varepsilon \mu }}}}} \right)

    D

    (ε0μ0εμ)1/2  {\left( {\frac{{{{\rm{\varepsilon }}_0}{{\rm{\mu }}_0}}}{{{\rm{\varepsilon \mu }}}}} \right)^{1/2}}{\rm{\;}}

    Question Tags

    📚 Subject:Physics
    📑 Chapter:Electromagnetic Waves
    🎯Topic:Maxwell'S Equation, Displacement Current
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :index of refraction, permittivity, permeability, speed of light
    89.

    If ε0  and  μ0{{\rm{\varepsilon }}_0}{\rm{\;and\;}}{{\rm{\mu }}_0} are the electric permittivity and magnetic permeability of free space and ε  and  μ{\rm{\varepsilon \;and\;\mu }} are the corresponding quantities in the medium, the index of refraction of the medium in terms of above parameter is

    A

    εμε0μ0\frac{{{\rm{\varepsilon \mu }}}}{{{{\rm{\varepsilon }}_0}{{\rm{\mu }}_0}}}

    B

    ${\left( {\frac{{{\rm{\varepsilon \mu }}}}{{{{\rm{\varepsilon }}_0}{{\rm{\mu }}_0}}}\begin{array}{*{20}{c}}

    {\rm{;}}\

    {\rm{;}}

    \end{array}} \right)^{1/2}}$

    C

    (ε0μ0εμ)\left( {\frac{{{{\rm{\varepsilon }}_0}{{\rm{\mu }}_0}}}{{{\rm{\varepsilon \mu }}}}} \right)

    D

    (ε0μ0εμ)1/2  {\left( {\frac{{{{\rm{\varepsilon }}_0}{{\rm{\mu }}_0}}}{{{\rm{\varepsilon \mu }}}}} \right)^{1/2}}{\rm{\;}}

    Question Tags

    📚 Subject:Physics
    📑 Chapter:Electromagnetic Waves
    🎯Topic:Maxwell'S Equation, Displacement Current
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :index of refraction, permittivity, permeability, speed of light
    90.

    If cc is the speed of electromagnetic waves in vacuum, its speed in a medium of dielectric constant KK and relative permeability μr{{\mu _r}} is

    A

    v=1μrKv = \frac{1}{{\sqrt {{\mu _r}K} }}

    B

    v=cμrKv = c\sqrt {{\mu _r}K}

    C

    v=cμrKv = \frac{c}{{\sqrt {{\mu _r}K} }}

    D

    v=KμrCv = \frac{K}{{\sqrt {{\mu _r}C} }}

    Question Tags

    📚 Subject:Physics
    📑 Chapter:Electromagnetic Waves
    🎯Topic:Electromagnetic Spectrum
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :2 mins
    🔄Ncert Concepts :electromagnetic waves, speed of light in medium, dielectric constant, relative permeability

    Showing 81 to 90 of 116 entries

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