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PHY134_MagneticForce2

# PHY134_MagneticForce2 - Experiment 6 PHY134 Classical...

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Experiment 6 PHY134 - Classical Physics II Laboratory Magnetic Forces - 2 In this experiment a simple current balance will be used to measure the force on a current-carrying wire in a magnetic field. The magnetic field is produced by a solenoid, and from the magnitude of the force on the wire the number of turns in the solenoid will be calculated. Equipment 5 A Power Supply, Helmholtz Coils 500 mA Power Supply, 5A Current shunt, 2 Digital Multimeters Electronic weight scale, 100-turn triangular coil with balance arm. Method The torque balance is shown schematically in Figure 1. The balance arm is a thin rectangular insulator upon which a 100-turn triangular coil is mounted. The coil is balanced by a weight resting on the pan of electronic scale. A small counterweight (a short piece of wire) is hung from the hook near the small coil to provide a gravitational torque τ g , about an axis through the attachment point of the main weight, and will be counter-balanced by the magnetic torque τ m produced when current flows in the 100-turn coil in the presence of the horizontal magnetic field near the center of the Helmholtz coils. The torque on a coil of N windings, of area A and carrying a current I , mounted in a magnetic field B (assumed constant over the coil's area) is given by: file:///C|/Documents%20and%20Settings/Michael/My%20Documents/PhyCourses/PHY132/PHY134_MagneticForce2.html (1 of 3)3/12/2004 9:19:10 AM

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PHY134_MagneticForce2 - Experiment 6 PHY134 Classical...

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