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Unformatted text preview: PHYSICS 127 EXPERIMENT NO. 7 INDUCTION In part I of this experiment, the voltage induced in a coil of wire by a changing magnetic flux will be observed. In part II, the magnetic field along the axis of a current loop will be precisely measured. A. Equipment 1 Oscilloscope, 1 Set of Induction Coils, 1 Large Loop Coil, 1 Oscillator, 1 Probe Coil with Amplifier, 1 DC Power Supply, 1 Tap Switch, 1 Galvanometer, 1 Bar Magnet, 1 Magnetic Compass. B. Method 1. In part I, a galvanometer G is connected to the terminals of an induction coil (the larger of the pair) as shown below. A magnetic field is produced by a bar magnet (Fig. 1a) or by a second coil set up inside the larger coil (Fig. 1b). The currents induced in the larger coil as the field changes are observed with the galvanometer. G Figure 1. Induction Coil Setups. Bar Magnet S N G to DC Power Source a) b) 2. The magnetic field produced by a current loop will be measured with a probe coil. The dependence of the magnetic field on the distance x will be compared with the textbook equation 31-22 on p. 723, 7 th ed. or equation 29-16 on pp. 815, 8 th ed. The basic setup is shown in Figure 2.The large coil, which is connected to an oscillator (function generator), produces a time-varying magnetic field. This field induces a voltage in the small probe coil proportional to the strength of the field. An oscilloscope is used to measure the signal induced in the probe coil. Oscillator...
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This note was uploaded on 09/27/2009 for the course PHY 126 taught by Professor Staff during the Spring '08 term at SUNY Stony Brook.
- Spring '08