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# Lab7 - Lab 7 Force on a current carrying wire placed in a...

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Lab 7: Force on a current carrying wire placed in a magnetic field 1 Introduction During the course of this lab, you will be able to mea- sure the force on a current carrying segment of wire placed in a magnetic field. Your measurements will enable you to infer the strength of the magnetic field in which it is placed. You will be using a sensitive balance to measure this force. You will also be able to test the dependence of the force on the current through the wire, and the length of the wire. The magnetic field due to a finite current carrying wire can be found using the Biot-Savart law. When another current carrying wire is placed in this mag- netic field, it will experience a force. The direction of this force depends on the directions of the currents in both wires. You will study this force by placing a cur- rent carrying wire in the magnetic field produced by a set of permanent magnets rather than in a magnetic field produced by another current carrying wire. It might interest you that the force that you will mea- sure finds widespread applications. For example, this force is used to magnetically levitate, guide, and pro- pel trains that can run at speeds in excess of 300 km/hr. The force that you will study is often (misleadingly) termed as the magnetic force on a current carrying wire. Actually, the motion of charge carriers (cur- rent) in a wire placed in a magnetic field will cause the charge carriers to experience a magnetic force, and pile up on one side of the wire. This causes a charge separation in the wire. The resulting electric field ex- erts a force on the lattice of ions that make up the wire. Therefore, the entire wire experiences a force. EXERCISE 1 PERTAINS TO THE BACK- GROUND CONCEPTS AND EXERCISES 2- 4 PERTAIN TO THE EXPERIMENTAL SEC- TIONS. MT66 MT70 MT65 MT76 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT120 MT73 MT102MT105MT101MT108MT100MT32MT105MT110MT116MT111MT32MT112MT97MT103MT101 Figure 1: Force on a current carrying wire placed in a uniform

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Lab7 - Lab 7 Force on a current carrying wire placed in a...

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