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Charge moving in elliptical orbit under Coulomb field.

  1. Jul 8, 2012 #1

    AGNuke

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    Gold Member

    Under the influence of the coulomb field of charge +Q, a charge −q is moving around it in an elliptical
    orbit. Find out the correct statement(s).
    (A) The angular momentum of the charge −q is constant
    (B) The linear momentum of the charge −q is constant
    (C) The angular velocity of the charge −q is constant
    (D) The linear speed of the charge −q is constant


    I am blank at this one. I don't know how to find either one, especially since this is elliptical orbit.

    All I know is that since it is elliptical orbit, speed is not constant, so is velocity and thus, linear momentum. Now I am confused between what is constant, angular velocity or angular momentum.

    I tried balancing electrostatic force with centrifugal force at any arbitrary point, but so far, I didn't got any satisfactory conclusions from my efforts.
     
  2. jcsd
  3. Jul 8, 2012 #2
    If there is no torque on the charge then its angular momentum is constant.
     
  4. Jul 8, 2012 #3

    AGNuke

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    Gold Member

    Oh! Thanks.
     
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