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The magnetic force and current

  1. Feb 15, 2007 #1
    1. The problem statement, all variables and given/known data
    a thin, uniform rod, which has a length of 0.45 m and a mass of 0.080 kg. This rod lies in the plane of the paper and is attached to the floor by a hinge at point P. A uniform magnetic field of 0.25 T is directed perpendicularly into the plane of the paper. There is a current I = 3.8 A in the rod, which does not rotate clockwise or counter-clockwise. Find the angle .

    2. Relevant equations
    F = ILB sin(theta)
    F= ma

    3. The attempt at a solution
    heres what i was thinking:
    if F = ILB sin(theta) then let ma = ILBsin(theta)

    so solve for theta:
    arcsine(ILB/ma) = 33.0 degrees however, i was told this is wrong.
  2. jcsd
  3. Feb 16, 2007 #2


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    Do the magnetic and gravitational forces act in the same direction? Hint: no. Draw a force diagram.
  4. Feb 16, 2007 #3


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    Also, is the theta in your picture the same as the theta in the B equation? Hint: no.
  5. Feb 17, 2007 #4
    thanks for the help. i think it got it finally.
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