This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
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....
View Full Document
- Spring '09