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Homework Help: Force between two current carrying wires

  1. Dec 2, 2015 #1

    I've learnt how to know the direction of force on a current carrying conductor when placed in a magnetic field.( Fleming's left hand rule)

    Is there a similar rule to calculate the force in this case? Or should the force be 0 since the wires are perpendicular to each other?

    In general, how to calculate force between two current carrying wires?

    Looking forward to some guidance.
  2. jcsd
  3. Dec 2, 2015 #2
    I think the force on PQ is "down" the page. Using right hand rule.
    Last edited: Dec 2, 2015
  4. Dec 2, 2015 #3


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    Staff: Mentor

    Hi Shivansh,

    Please remember to use the formatting template for posts in the homework areas.

    You can use a right hand rule to establish the field direction due to the XY current at locations along PQ. Then imagine a current carrier (a positive charge) moving in PQ according to the current in that wire. Use a right hand rule to determine the force direction that the moving charge would feel.

    Re-drawing the setup so that the current ##I## in XY is flowing into the page, the field lines form circular paths around it:

    As you can see, a positive current carrier (moving charge) in current ##i## along PQ will feel a force as determined by the right hand rule. The force on a given charge will vary with the strength of the field (distance from the current ##I##).
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