Home
Class 12
PHYSICS
An electromagnetic wave in vacuum has th...

An electromagnetic wave in vacuum has the electric and magnetic fields `vecE` and `vecB`, which are always perpendicular to each other. The direction of polarization is given by `vecX` and that of wave propagation by `veck`. Then

A

`vecX||vecE` and `veck||vecExxvecB`

B

`vecX||vecB` and `veck||vecE xx vecB`

C

`vecX||vecE` and `veck||vecBxxvecE`

D

`vecX||vecB` and `veck||vecBxxvecE`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC WAVES

    CHHAYA PUBLICATION|Exercise EXERCISE (VERY SHORT ANSWER )|16 Videos
  • ELECTROMAGNETIC WAVES

    CHHAYA PUBLICATION|Exercise EXERCISE (SHORT ANSWER TYPE QUESTION -I)|3 Videos
  • ELECTROMAGNETIC WAVES

    CHHAYA PUBLICATION|Exercise NCERT EXEMPLAR QUESTIONS|7 Videos
  • ELECTROMAGNETIC INDUCTION & ALTERNATING CURRENT

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|28 Videos
  • ELECTROMAGNETISM

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|26 Videos

Similar Questions

Explore conceptually related problems

‘Energy of an electromagnetic wave is equally shared between electric and magnetic fields’--explain your answer.

Electromagnetic waves propagate through free space or a medium as transverse waves. The electric and magnetic fields are perpendicular to each other as well as perpendicular to the direction of propagation of waves at each point. In the direction of wave propagation, electric field vecE and magnetic field vecB form a right-handed cartesian coordinate system. During the propagation of electromagnetic wave, total energy of electromagnetic wave is distributed equally between electric and magnetic fields. Since in_0 and mu_0 are permittivity and permeability of free space, the velocity of electromagnetic wave, c=(in_0 mu_0)^(-1//2) . Energy density i.e., energy in unit volume due to electric field at any point, u_E=1/2in_0E^2 Similarly, energy density due to magnetic field , u_M=1/(2mu_0)B^2 . If the electromagnetic wave propagates along x-direction, then the equations of electric and magnetic field are respectively. E=E_0sin(omegat-kx) and B=B_0sin(omegat-kx) Here, the frequency and the wavelength of oscillating electric and magnetic fields are f=omega/(2pi) and lambda=(2pi)/k respectively. Thus E_"rms"=E_0/sqrt2 and B_"rms"=B_0/sqrt2 , where E_0/B_0=c . Therefore, average energy density baru_E=1/2in_0E_"rms"^2 and baru_M=1/(2mu_0)B_"rms"^2 . The intensity of the electromagnetic wave at a point, I=cbaru=c(baru_E+baru_B) . To answer the following questions , we assume that in case of propagation of electromagnetic wave through free space, c=3xx10^8 m.s^(-1) and mu_0=4pixx10^(-7) H.m^(-1) If the peak value of electric field at a point in electromagnetic wave is 15 V . m^(-1) , then average electrical energy density (in j . m^(-3) )

Electromagnetic waves propagate through free space or a medium as transverse waves. The electric and magnetic fields are perpendicular to each other as well as perpendicular to the direction of propagation of waves at each point. In the direction of wave propagation, electric field vecE and magnetic field vecB form a right-handed cartesian coordinate system. During the propagation of electromagnetic wave, total energy of electromagnetic wave is distributed equally between electric and magnetic fields. Since in_0 and mu_0 are permittivity and permeability of free space, the velocity of electromagnetic wave, c=(in_0 mu_0)^(-1//2) . Energy density i.e., energy in unit volume due to electric field at any point, u_E=1/2in_0E^2 Similarly, energy density due to magnetic field , u_M=1/(2mu_0)B^2 . If the electromagnetic wave propagates along x-direction, then the equations of electric and magnetic field are respectively. E=E_0sin(omegat-kx) and B=B_0sin(omegat-kx) Here, the frequency and the wavelength of oscillating electric and magnetic fields are f=omega/(2pi) and lambda=(2pi)/k respectively. Thus E_"rms"=E_0/sqrt2 and B_"rms"=B_0/sqrt2 , where E_0/B_0=c . Therefore, average energy density baru_E=1/2in_0E_"rms"^2 and baru_M=1/(2mu_0)B_"rms"^2 . The intensity of the electromagnetic wave at a point, I=cbaru=c(baru_E+baru_B) . To answer the following questions , we assume that in case of propagation of electromagnetic wave through free space, c=3xx10^8 m.s^(-1) and mu_0=4pixx10^(-7) H.m^(-1) if the wavelength is 1000Å, then the frequency (in Hz)

Electromagnetic waves propagate through free space or a medium as transverse waves. The electric and magnetic fields are perpendicular to each other as well as perpendicular to the direction of propagation of waves at each point. In the direction of wave propagation, electric field vecE and magnetic field vecB form a right-handed cartesian coordinate system. During the propagation of electromagnetic wave, total energy of electromagnetic wave is distributed equally between electric and magnetic fields. Since in_0 and mu_0 are permittivity and permeability of free space, the velocity of electromagnetic wave, c=(in_0 mu_0)^(-1//2) . Energy density i.e., energy in unit volume due to electric field at any point, u_E=1/2in_0E^2 Similarly, energy density due to magnetic field , u_M=1/(2mu_0)B^2 . If the electromagnetic wave propagates along x-direction, then the equations of electric and magnetic field are respectively. E=E_0sin(omegat-kx) and B=B_0sin(omegat-kx) Here, the frequency and the wavelength of oscillating electric and magnetic fields are f=omega/(2pi) and lambda=(2pi)/k respectively. Thus E_"rms"=E_0/sqrt2 and B_"rms"=B_0/sqrt2 , where E_0/B_0=c . Therefore, average energy density baru_E=1/2in_0E_"rms"^2 and baru_M=1/(2mu_0)B_"rms"^2 . The intensity of the electromagnetic wave at a point, I=cbaru=c(baru_E+baru_B) . To answer the following questions , we assume that in case of propagation of electromagnetic wave through free space, c=3xx10^8 m.s^(-1) and mu_0=4pixx10^(-7) H.m^(-1) Relation between omega and k

A particle with charge q moves with a velocity V in a direction perpendicular to the directions of uniform electric and magnetic fields, E and B respectively, which are mutually perpendicular to each other. Which one of the following gives the condition for which the particle moves undeflected in its original trajectory ?

What are the directions of electric and magnetic field vectors relative to each other and relative to the direction of propagation of electromagnetic waves?

CHHAYA PUBLICATION-ELECTROMAGNETIC WAVES -EXERCISE (MCQ)
  1. mu0 and in0 are the magnetic permeability and the electric permittivit...

    Text Solution

    |

  2. Electric flux enclosed by a surface A is given by - (A) in0 int vecE....

    Text Solution

    |

  3. Electromagnetic waves are produced by - (A) A static charge. (B) A un...

    Text Solution

    |

  4. Of the following frequencies, which one may be the frequency of a radi...

    Text Solution

    |

  5. Of the following frequencies, which one may be the frequency of X-rays...

    Text Solution

    |

  6. Of the following frequencies, which one may be the frequency of an inf...

    Text Solution

    |

  7. Wavelengths of microwave, ultraviolet and infrared rays are lambdam,la...

    Text Solution

    |

  8. Which one of the following is not an electromagnetic wave?

    Text Solution

    |

  9. Which of the following has the shortest wavelength?

    Text Solution

    |

  10. Frequency orders of gamma-rays, X-rays, UV rays are a, b and c respect...

    Text Solution

    |

  11. The decreasing order of wavelength of infrared, micro- wave, ultraviol...

    Text Solution

    |

  12. Electromagnetic wave is a kind of - (A) Matter wave (B) Stationary wa...

    Text Solution

    |

  13. Which phenomenon proves that electromagnetic waves are transverse wave...

    Text Solution

    |

  14. The ratio between the amplitudes of electric and magnetic fields at an...

    Text Solution

    |

  15. In a plane electromagnetic wave, the electric field (E) having amplitu...

    Text Solution

    |

  16. The electric and the magnetic field associated with an em wave propaga...

    Text Solution

    |

  17. An electromagnetic wave in vacuum has the electric and magnetic fields...

    Text Solution

    |

  18. The electric field associated with an em wave in vacuum is given by ve...

    Text Solution

    |