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An em wave is propagating in a medium wi...

An em wave is propagating in a medium with a velocity `vec(V)=V hat(i)`. The instantaneous oscillating electric field of this em waves is along + y axis. Then the direction of oscillating magnetic field of the em wave will be along

A

`-x` direction

B

`-z` direction

C

`-y` direction

D

`+z` direction

Text Solution

Verified by Experts

The correct Answer is:
D
`vec(v)=vec(E )xx vec(B)`
`therefore hat(i)=hat(j)xx hat(k)`
`therefore` Direction of `vec(B)` is in `+z` direction.
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Knowledge Check

  • If electric field in electromagnetic wave propagating along north is verically upward then magnetic field will be towards …….

    A
    north
    B
    east
    C
    west
    D
    vertically downward

  • If vec(E ) and vec(B) represent electric and magnetic field vectors of the electromagnetic wave, the direction of propagation of electromagnetic wave is along

    A
    `vec(E )`
    B
    `vec(B)`
    C
    `vec(B)xx vec(E )`
    D
    `vec(E )xx vec(B)`

  • The ratio of contributions made by the electric field and magnetic field components to the intensity of an EM wave is

    A
    c : 1
    B
    `c^(2):1`
    C
    `1:1`
    D
    `sqrt(c ):1`

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