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Need Help On Electrical Potential Energy!

  1. Jan 31, 2005 #1
    I need help on these ?'s. They are very confusing to me. Can someone please help me.
    -Here they are:

    >Two charges are located along the x-axis. ONe has a charge of 6.4 micro C, and the second has a charge of -3.2 micro C. If the electrical potential energy associated with the pair of charges is -4.1x10 to the -2 J, what is the distance between the charges?

    >A charge moves a distance of 2.0 cm in the direction of a uniform electric field having a magnitude of 215 N/C. The electrical potential energy of the charge decreases by 6.9x10 to the -19 J as it moves. Find the magnitude of the charge on the moving particle. (Hint: The electrical potential energy depends on the distance moved in the direction of the field.)

    >Two alpha particles (helium Nuclei), each consisting of two protons and two neutrons, have and electrical potential energy of 6.32x10 to the -19 J. What is the distance between these particles at this time?

    Thanks!
     
  2. jcsd
  3. Jan 31, 2005 #2
    I'm assuming this is homework and you aren't just doing these for fun, so we need to see you attempt the problems first.
     
    Last edited: Jan 31, 2005
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