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How are electromagnetic waves produces by oscillating charges ? Draw a sketch of linearly polarised em waves propagating in z-direction. Indicate the direction of oscillating electric and magnetic fields

Text Solution

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An oscillating charge produces an oscillating electric field in space, which produces an oscillating magnetic field. The oscillating electric and magnetic fields regenerate each other, and this results in the production of em waves in space.
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Knowledge Check

  • A plane electromagnetic wave3 of wavelength lambda has an indentsity I. It is propagating along the position Y - direction. The allowed expressions for the electric and magnetic fields are given by

    A
    `vecE=sqrt((I)/(epsilon_(0)C))cos[(2pi)/(lambda)(y-ct)]hati,vecB=(1)/(c)Ehatk`
    B
    `vecE=sqrt((I)/(epsilon_(0)C))cos[(2pi)/(lambda)(y-ct)]hatk,vecB=-(1)/(c)Ehati`
    C
    `vecE=sqrt((2I)/(epsilon_(0)C))cos[(2pi)/(lambda)(y-ct)]hatk,vecB=+(1)/(c)Ehati`
    D
    `vecE=sqrt((2I)/(epsilon_(0)C))cos[(2pi)/(lambda)(y-ct)]hatk,vecB=-(1)/(c)Ehatj`

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    (a) An e.m. wave is travelling in a medium with a velocity vecv=vhati .Draw a sketch showing the propagation of the e.m. wave, indicating the direction of the oscillating electric and magentic fields. (b) How are the magnitudes of the electric and magnetic fields related to the velocity of the e.m. wave?

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