Physics 202 (Lab 9) Solenoid - Measurement of Magnetic Field in a Coil halfway.docx - Physics 202(College Physics Laboratory Exercise(9 The Magnetic

Physics 202 (Lab 9) Solenoid - Measurement of Magnetic Field in a Coil halfway.docx

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Physics 202 (College Physics) Laboratory Exercise (9) The Magnetic Field in a Coil Equipment needed: Computer, DC Power Supply Vernier computer interface Logger Pro , Vernier Magnetic Field Sensor, Mailing or poster tube, 4–10 cm diameter, with a hole drilled for the sensor, magnetic compass, long spool of insulated wire (at least 1 m) Introduction : When an electric current flows through a wire, a magnetic field is produced around the wire. The magnitude and direction of the field depends on the shape of the wire and the direction and magnitude of the current through the wire. A solenoid is a long coil of wire consisting of many loops (or turns, N ) of wire. A solenoid act like a magnet: one end can be considered the North pole, and the other the South pole, depending on the direction of the current in the loops. For an ideal solenoid shown in Figure 1 the magnetic field B inside a tightly wrapped solenoid with number of turns N , length L , each carrying current I can be calculated from Ampere’s law and has magnitude Figure 1 B = μ 0 L ¿ where: μ 0 – the permeability constant = 4π × 10 –7 [T·m/A], Objectives : 1. In this experiment, you will examine how the magnetic field is related to both the current I through a coil and the number of turns N in a coil. 2. A Magnetic Field Sensor will be used to detect the magnetic field B at the center of the coil. 3. The sensor will also detect the Earth’s field and any local fields due to electric currents or some metals in the vicinity of the sensor. 4. To ensure we are measuring the field we intend to, being the magnetic field generated by the solenoid, there is a particular process that must be followed. Initial Setup: 1. Using the long spool of wire, loop the wire 10 times around the end of the tube with the hole, creating a coil of 10 turns. The coil should be next to, but not cover, the hole.
2. Bend the tip of the Magnetic Field Sensor so the tip is perpendicular to the shaft of the sensor, as shown in Figure 2a . The sensor measures magnetic fields parallel to the