If a current carrying coil is placed in a magnetic field (As shown in diagram above), a pair of forces will be produced on the coil. This is due to the interaction of the magnetic field of the permanent magnet and the magnetic filed of the current carrying coil. The diagram below shows the catapult field produced.

The direction of the force can be determined by Fleming's left hand rule. Since the current in both sides of the coil flow in opposite direction, the forces produced are also in opposite direction. The 2 forces in opposite direction constitute a couple which produces a turning effect to make the coil rotate.

Examples of electric equipment whose operation is based on this turning effect are
  1. the direct current motor
  2. the moving coil meter.


  1. Unknown // October 30, 2015 at 1:00 AM  

    I can't change the direction of the wind, but I can adjust my sails to always reach my destination. See the link below for more info.


  2. digibask // December 20, 2019 at 3:50 AM  

    You are not sure on how to get your first e-commerce website development then visit web design services kanpur we also help you to promote your business with the email marketing and message marketing.

  3. fest wishes // January 24, 2020 at 11:05 AM  

    I am glad reading your article. But should remark on few
    general things, The web site style is great, the articles is really nice
    If you want to know about the Desert tour and rates,For any query click the below link. Musandam tour,Desert safari tour,hatta tour

  4. digibask // January 25, 2020 at 12:54 AM  

    Thanks for the post. I’ll definitely comeback.
    I loved as much as you will receive carried out right here.
    For Website development visitWEBSITE DESIGN SERVICES KANPUR

  5. Bams // January 28, 2020 at 7:50 PM  

    thanks your post and share and visit my web at Percetakan Tali ID Card Murah dan Terbaik di Jakarta

  6. Top Gambling Site // February 19, 2020 at 7:45 PM  

    로투스 홀짝
    엔트리 파워 볼