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Homework Help: Electromagnetism question?

  1. Nov 6, 2012 #1
    1. The problem statement, all variables and given/known data

    A solenoid lies horizontally with a current balance WXYZ balanced in the solenoid core. Sides WX and ZY are 7.1 cm and side XY is 1.9cm. A current of 6.0A flows through the conductor of the balance. If a 17.6g mass is necessary to balance the current balance what is the magnetic field strength of the solenoid - ANSWER - 1.51T

    2. Relevant equations

    Fm=Fg
    BIL=mg

    3. The attempt at a solution
    i attempted to do them seperately.

    b= mg/IL that is literally all i can get from this perphaps if i was given a diagram it would help.

    Ive tried substituing l as 7,1 and 1.9, adding the two lengths and subtracting them didnt work
    anyone know how to do this?
     
  2. jcsd
  3. Nov 13, 2012 #2

    Simon Bridge

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    You should be able to sketch a solenoid and a current balance yourself.
    The question is asking you about induced currents due to a magnetic field.
     
  4. Nov 13, 2012 #3

    Simon Bridge

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    Science Advisor
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    You should be able to sketch a solenoid and a current balance yourself.
    The question is asking you about induced currents due to a magnetic field.
     
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