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Magnetic Force Balance

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  1. Magnetic Force Balance

  2. Features • Measures the dependence of the Magnetic Force on the Current • Measures the dependence of the Magnetic Force on the angle the current element makes with the Magnetic Field • Measures the magnetic field via the force produced on the current element • Explicitly demonstrates the Right Hand Rule (RHR) for the magnetic force on the current element • Demonstrates Newton’s Third Law since the force on the current element and the force on the magnet are an action-reaction pair. The wire visibly deflects due to the magnetic force

  3. Magnetic Force vs. Current

  4. Magnetic Force vs. Angle

  5. Magnetic Force vs. sin θ 2 Volts

  6. Magnetic Field Measurement 2x10-4kg x 9.8 m/s2 = 2 amp x 10-2 m x B x sin(π/2) B≈0.1 Tesla

  7. Summary and Conclusions • The apparatus is easy to construct from commercial parts with minimal fabrication • The experiment is robust and has been successfully tested • The apparatus demonstrates explicitly that the magnetic force is the cross product of the vector current element and the magnetic field

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