# 25 Magnetic Field in a Coil.pdf - 25 LabQuest The Magnetic...

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Physics with Vernier © Vernier Software & Technology 25 - 1 LabQuest 25 The Magnetic Field in a Coil 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. In this activity, you will examine how the magnetic field is related to both the current through a coil and the number of turns in a coil. A Magnetic Field Sensor will be used to detect the field at the center of the coil. 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, so you will need to account for these fields. Figure 1 OBJECTIVES l Use a Magnetic Field Sensor to measure the field at the center of a coil. l Determine the relationship between magnetic field and the number of turns in a coil. l Determine the relationship between magnetic field and the current in a coil. l Explore the Earth’s magnetic field in your room.
Experiment 25 MATERIALS LabQuest LabQuest App Vernier Magnetic Field Sensor Extech Digital DC Power Supply 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) 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 not cover the hole. 2. Connect the coil and power supply, as shown in Figure 1. 3. Bend the tip of the Magnetic Field Sensor so the tip is perpendicular to the shaft of the sensor, as shown in Figure 2. Set the range switch on the sensor to 6.4 mT (low amplification). Connect the Magnetic Field Sensor to LabQuest. Choose New from the File menu. Figure 2 4. Set up the data-collection mode. a. On the Meter screen, tap Mode. Change the data-collection mode to Events with Entry.