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Help me Guys ! i need the answer of this 3 question

  1. Jun 20, 2011 #1
    Help me Guys ! i need the answer of this 3 question :(

    Guys ?? i really need the answer of this 3 questions .. I don't know how to answer this one .. help me guys ..


    1.) Compute the electric force acting between the electron and the proton in a hydrogen atom. The radius of the electron's orbit around the proton is about 5.3x10^(-11) m.



    2.) The current that flows through an incandescent light bulb immediately after it is turned on is higher than the current that flows moment later. Why?



    3.) A permanent magnet is made of a ferromagnetic material with a magnetization M of about 8x10^5 A/m. The magnet is in the shape of a cube of side 2 cm.

    a.) Find the magnetic dipole moment of the magnet.

    b.) Estimate the magnetic field due to the magnet at a point 10 cm from the magnet along its axis.





    NOTES:

    1.) 5.3x10^(-11) is "5.3 times 10 raised to the exponent -11".

    8x10^5 is "8 times 10 raised to the exponent 5".

    2.) Problem #3 is a sample problem in University Physics by Young & Freedman (11th or 12th edition) so provide the necessary details.

    ========================================================
    Thanks In advance
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Jun 20, 2011 #2

    Pengwuino

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    Gold Member

    Re: Help me Guys ! i need the answer of this 3 question :(

    We don't do your homework here. Show some effort first.
     
  4. Jun 20, 2011 #3
    Re: Help me Guys ! i need the answer of this 3 question :(

    huhuhuhuh :( but i need the answer .. huhuhuh :( please help me :(
     
  5. Jun 21, 2011 #4
    Re: Help me Guys ! i need the answer of this 3 question :(

    We will help if you show us some work towards finding it. Whining isn't going to get you any closer to an answer from us.
     
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