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Homework Help: Calculations involving DC Electric Motors, Magnietism and magnetic field strength

  1. Aug 19, 2012 #1
    1. The problem statement, all variables and given/known data

    An electric motor has a square coil with 20 turns and an area of 150cm^2. the coil is free to rorate in uniform magnetic field of 300mT. If there is a DC current of 5.00A, passing through the coil: what is the maximum force on one side of the coil? and what is the maximum torque on the coil?

    2. Relevant equations

    3. The attempt at a solution
    well i realised that there are 5 loops of this coil, i also figured that each turn is 7.5cm long. (150/4) = 37.5 (37.5/5) = 7.5cm, and im not sure where to go from here.
  2. jcsd
  3. Aug 19, 2012 #2


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    welcome to pf!

    hi gaimesh! welcome to pf! :smile:
    uhh? there are 20 loops … and you can't divide an area by 4 to get a length! :rolleyes:

    try again, and start by writing out the formula you wish to use :smile:
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