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Torque of a rotating coil

  1. May 17, 2014 #1
    1. The problem statement, all variables and given/known data

    for this question, since area of cutting of magnetic field change, so magnetic flux change, f is unchanged . but i dont understand why the torque will change since the force is unchanged, since torque=FORCE X DISTANCE FROM THE ROTATING PIVOT

    2. Relevant equations



    3. The attempt at a solution
     

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  2. jcsd
  3. May 17, 2014 #2
    Distance between the line of action of the force and the pivot is changing.
     
  4. May 17, 2014 #3
    Can you explain.further. I can't see and understand the situation.
     
  5. May 17, 2014 #4

    TSny

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    Careful. Torque is generally not equal to the product of the force, F, and the distance, r, between the axis of rotation and the point of application of the force. As dauto is pointing out, torque is the product of force and "lever arm", d.
     

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