MagneticForce-II - PHY124 Magnetic Force II Exp. 4b...

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Unformatted text preview: PHY124 Magnetic Force II Exp. 4b Abstract 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. 1 Knowledge, Understanding, and Skills You should have a hands-on experience and ability with all the following: The concept of magnetic moment. The concept of magnetic torque. How to change balance readings into torques. The formula for magnetic field of a helmholtz coil. 2 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. 3 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 PHY124 Magnetic Force II Exp. 4b Figure 1: Here is a sketch of the lab setup. electronic scale. A small counterweight (a short piece of wire) is hung from the hook near the small coil to provide a gravitational torque g , about an axis through the attachment point of the main weight, and will be counter-balanced by the magnetic torque B produced when current flows in the 100-turn coil in the presence of the horizontal magnetic field near the center of the Helmholtz coils.presence of the horizontal magnetic field near the center of the Helmholtz coils....
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MagneticForce-II - PHY124 Magnetic Force II Exp. 4b...

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