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MagneticForce

# MagneticForce - PHY124 Magnetic Force Exp 4 Abstract The...

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PHY124 Magnetic Force Exp. 4 Abstract The purpose of this laboratory is to investigate Faraday’s Law ( V coil = - N d Φ B dt ). We will do this by forcing a change in magnetic flux (Φ B ) through a coil through several different means: 1. Inserting and removing a bar magnet from a “pickup” coil. 2. Inserting and removing a coil with a constant current from a “pickup” coil. 3. Creating a varying flux using an AC power supply. In the above list, the term “pickup” coil indicates that this coil is hooked to some device that measures either the current or voltage developed on the coil. In this way, we consider this coil to have “picked up” a signal of the varying flux. For the first two experiments, we will detect the current in the coil using a galvanometer (a fancy term for an old-fashioned current meter). In the final experiment, we will instead measure the voltage on the coil using an oscilloscope. 1 Knowledge, Understanding, and Skills You should have a “hands-on” experience and ability with all the following: Using the right-hand rule to determine the direction of magnetic forces. Using Lenz’ Law to determine which way current will flow (so as to oppose change). 2 Equipment 1 oscilloscope 1 bar magnet 1 small coil 1 large coil 1 DC power supply 1 galvanometer 1 AC Voltage Generator

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PHY124 Magnetic Force Exp. 4 Figure 1: Here is the equipment of the lab.
PHY124 Magnetic Force Exp. 4 3 Varying the Magnetic Flux using a Bar Magnet In this first part of the lab, we will change the magnetic flux through a coil by inserting and removing a bar magnet. According to Faraday’s Law, we will generate a voltage in the coil in accordance with: V loop = - d Φ B dt (1) V coil = - N d Φ B dt (2) The minus sign in this formula carrys the same information as Lenz’ Law: The voltage (and current) that results from the change in magnetic flux is in the direction that opposes the change in the magnetic flux.

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