Home
Class 12
PHYSICS
Assume that a lamp radiates power P unif...

Assume that a lamp radiates power P uniformly in all directions. The magnitude of electric field strength at a distance r from the lamp is

A

`E_(0)=(P_(0))/(2piepsilon_(0)cr^(2))`

B

`E_(0)=sqrt(P_(0))/(2piepsilon_(0)cr^(2))`

C

`E_(0)=sqrt(P_(0))/(4piepsilon_(0)cr^(2))`

D

`E_(0)=sqrt(P_(0))/(s8piepsilon_(0)cr)`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC WAVES

    AAKASH SERIES|Exercise EXERCISE -IB|37 Videos

  • ELECTROMAGNETIC WAVES

    AAKASH SERIES|Exercise EXERCISE -II|22 Videos

  • ELECTROMAGNETIC WAVES

    AAKASH SERIES|Exercise EXERCISE -II|22 Videos

  • ELECTROMAGNETIC INDUCTION

    AAKASH SERIES|Exercise Additional Exercise|11 Videos

  • ELECTROMAGNETICS

    AAKASH SERIES|Exercise ADDITIONAL EXERCISE|13 Videos

Similar Questions

Explore conceptually related problems

A lamp radiates power P_(0) uniformly in all directions, the amplitude of elctric field strength E_(0) at a distance r from it is

A 100W sodium lamp radiates energy uniformly in all directions. The lamp is located at the center of a large sphere that absorbs all the sodium light which is incident on it. The wavelength of the sodium light is 589nm. (a) What is energy associated per photon with the sodium light? (b) At what rate are photons delivered to the sphere?

A 100W sodium lamp radiates energy uniformly in all directions. The lamp is located at the center of a large sphere that absorbs all the sodium light which is incident on it. The wavelength of the sodium light is 589nm. (a) What is energy associated per photon with the sodium light? (b) At what rate are photons delivered to the sphere?

A non-conducting solid sphere of radius R is uniformly charged. The magnitude of the electric filed due to the sphere at a distance r from its centre

Figure shows equipotential surfaces concentric at O the magnitude of electric field at a distance r measured from O is

A charge q is uniformly distributed over a quarter circular ring of radius r . The magnitude of electric field strength at the centre of the ring will be

A hallow metal sphere of radius R is uniformly charged. The electric field due to the sphere at a distance r from the centre:

A long thin flat sheet has a uniform surface charge density sigma . The magnitude of the electric field at a distance .r. from it is given by

A point charge Q is placed at the centre of a spherical conducting shell. A total charge of -q is placed on the shell. The magnitude of the electric field at point P_1 at a distance R_1 from the centre is X. The magnitude of the electric field due to induced charges at point P_2 a distance R_2 from the centre is Y. The values of X and Y are respectively.

A uniform but time-varying magnetic field B(t) exists in a circular region of radius a and is directed into the plane of the paper, as shown. The magnitude of the induced electric field at point P at a distance r from the centre of the circular region

AAKASH SERIES-ELECTROMAGNETIC WAVES-EXERCISE -IA
  1. An electromagnetic radiation has an energy 14.4eV. To which region of ...

    Text Solution

    |

  2. The frequency of gamma-rays, X-rays and ultraviolet rays are a,b,c and...

    Text Solution

    |

  3. Assume that a lamp radiates power P uniformly in all directions. The m...

    Text Solution

    |

  4. When a low flying aeroplane passes over head, we sometimes notice a sl...

    Text Solution

    |

  5. A : If the earth did not have an atmosphere, its average surface temp...

    Text Solution

    |

  6. Ozone layer protestes the living cells from

    Text Solution

    |

  7. Ozone layer blocks the radiations of wave length: (1.) less than 3 × ...

    Text Solution

    |

  8. Practically ozone layer absorbs the radiation of wavelength

    Text Solution

    |

  9. A radiation of energy E falls normally on a perfectly reflecting surfa...

    Text Solution

    |

  10. The type of electromagnetic wave propagation which is effected as a re...

    Text Solution

    |

  11. X-rays are known as to be electromagnetic radi­ation. Therefore the X-...

    Text Solution

    |

  12. The altitude of the ozone layer in the atmosphere and the ‘type’ of th...

    Text Solution

    |

  13. Four atmospheric layers are given below, namely (i) stratosphere (ii) ...

    Text Solution

    |

  14. Infrared radiations are detected by

    Text Solution

    |

  15. Finger prints on a piece of paper may be detected by sprinkling fluore...

    Text Solution

    |

  16. The atmosphere above the height of 80 km is called

    Text Solution

    |

  17. The frequency from 3Hz to 30MHz is known as

    Text Solution

    |

  18. The frequency from 3xx10^(9) Hz to 3xx10^(10) Hz is

    Text Solution

    |

  19. A cube of edge a has its edges parallel to X, Y and Z -axis of rectang...

    Text Solution

    |

  20. Green house effect is

    Text Solution

    |