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Posted by on Thursday, January 24, 2008 at 10:59am.

How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.8 µC?

  • Physics - , Thursday, January 24, 2008 at 11:01am

    Do you know the charge per electron?


    number*charge per electron= total charge

    solve for number.

  • Physics - , Thursday, January 24, 2008 at 11:19am

    i don't know what you mean about the charge of the electron? or what number do you times it by.

  • Physics - , Thursday, January 24, 2008 at 1:26pm

    http://scienceworld.wolfram.com/physics/ElectronCharge.html

    number electrons= totalcharge/chargeperelectron

  • Physics - , Friday, January 25, 2008 at 1:15pm

    q=(n*e).....(i)
    where, q= charge,
    n=number,
    e= charge of an electron
    n=q/e....(i) (from equation i)
    given,q= +2.8mc= +2.8*10^-6 c
    we know, charge of an electron(e)=1.6*10^-19 c

    hence n= (2.8*10^-6)/(1.6*10^-19)
    = 1.75*10^13
    so, 1.75*10^13number of charges should ne removed.

  • Physics(last line:correction) - , Friday, January 25, 2008 at 10:19pm

    q=(n*e).....(i)
    where, q= charge,
    n=number,
    e= charge of an electron
    n=q/e....(i) (from equation i)
    given,q= +2.8mc= +2.8*10^-6 c
    we know, charge of an electron(e)=1.6*10^-19 c

    hence n= (2.8*10^-6)/(1.6*10^-19)
    = 1.75*10^13
    so, 1.75*10^13number of charges should be removed.

  • Physics - , Wednesday, March 17, 2010 at 8:34am

    what? i don't get it. ISn't 1.72*10^3 the number of electrons for 2.7uC?

  • ÝÖíáÉ ÓÚÏÇä - , Sunday, January 2, 2011 at 1:53pm

    ÏáßäÇ ÞÖíÈ ÈÞãÇÔ ÌÇÝ ÝÍãá ÔÍäÉ ÞíãÊåÇq=3.2*10 14-

  • Physics - , Wednesday, February 9, 2011 at 7:08pm

    1.5x10^13

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