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Write the expression for energy density ...

Write the expression for energy density of electric field E in free space.

A

`1//2epsi_(0)E^(2)`

B

`epsi_(0)E^(2)`

C

`2epsi_(0)E^(2)`

D

`epsi_(0)E`

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • Energy density in an electrostatic field E is

    A
    `1/2 CV^2`
    B
    `1/2 epsi_0 E^2`
    C
    `(2E^2)/(epsi_0)`
    D
    `epsi_0 E^2`

  • The expression for Ohm's law in terms of electric field E and current density J is:-

    A
    `E=(sigmaJ)^(1//2)`
    B
    `J=sigma//E`
    C
    `J=sigmaE`
    D
    `sigma=(J//e)^(1//2)`

  • Relation between energy density of electric field and magnetic field in em wave.

    A
    `U_E = U_B`
    B
    `U_E gt U_B`
    C
    `U_E lt U_B`
    D
    `U_E != U_B`

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    Show that the average energy density of the electric field vecE equals the average energy density of the magnetic field vecB , in electromagnetic waves.

    Compare the expression for magnetic energy density with electrostatic energy density stored in the space between the plates of a parallel plate capacitor.

    In an electromagnetic wave, the amplitude of electric field is 10V//m . The frequency of wave is 5xx10^14Hz . The wave is propagating along Z-axis, find (i) the average energy density of electric field (ii) the average energy density of magnetic field (iii) the total average energy density of EM wave.

    The energy density in an electric field of intensity 100 V/m is

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