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Unformatted text preview: PHY124 Magnetic Force I Exp. 4 Abstract The purpose of this laboratory is to measure the effects of a magnetic field on a current-carrying wire. In the lecture part of this class, we frequently consider a wire that appears to “float” in the air and thereby calculate the force on this wire as vector F = I vector L × vector B . Realistically, this is a quite unusual situation (since wires don’t float!). Instead, we will consider the effect of the magnetic force on a wire under tension. This is quite similar to the effect of gravity on a chain, resulting in a shape known as a “catenary curve”. By measuring the deflection of the wire, we’ll deduce the magnetic field it is placed in (the field of the earth itself). 1 Knowledge, Understanding, and Skills You should have a “hands-on” experience and ability with all the following: • How to use the Right Hand Rule to determine the direction of force on a current-carrying wire in a magnetic field. • The formula for magnetic force, vector F = I vector L × vector B . • Why there is a so-called “shunt” in your circuit and what it allows you to measure. • How to measure the position change with the microscope. • What is a reticule? • The derivation of the “catenary curve” equation. 2 Equipment • Power supply • Pulley and table clamp • Microscope with calibrated reticule • Viewing lamp • 50A Current shunt • Digital voltmeter • DPDT switch PHY124 Magnetic Force I Exp. 4 Figure 1: Here is a sketch of the lab setup.Figure 1: Here is a sketch of the lab setup....
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- Spring '09
- Force, Magnetic Field, ymax, Right-hand rule