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A relatively inexpensive ammeter, called a tangent galvanometer, can be made using the earth's field. A plane circular coil of N=100 turns and Radius R=15cm is oriented so the field that it produces in the center of the coil is either East or West. A compass is placed at the center of the coil. When there is no current in the coil, the compass-needle points to the north due the earth's 5.5x10^-5 T field. When there is current I in the coil, the compass needle points in the direction of the resultant magnetic field, at an angle 23° to the north. Find the current in the coil. Find the magnitude of the magnetic field due to the coil and the Earth at the center of the coil.

A relatively inexpensive ammeter, called a tangent galvanometer, can be made using the earth's field. A plane circular coil of N=100 turns and Radius R=15cm is oriented so the field that it produces in the center of the coil is either East or West. A compass is placed at the center of the coil. When there is no current in the coil, the compass-needle points to the north due the earth's 5.5x10^-5 T field. When there is current I in the coil, the compass needle points in the direction of the resultant magnetic field, at an angle 23° to the north. Find the current in the coil. Find the magnitude of the magnetic field due to the coil and the Earth at the center of the coil.

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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A relatively inexpensive ammeter, called a tangent galvanometer, can be made using the earth's field. A plane circular coil of N=100 turns and Radius R=15cm is oriented so the field that it produces in the center of the coil is either East or West. A compass is placed at the center of the coil. When there is no current in the coil, the compass-needle points to the north due the earth's 5.5x10^-5 T field. When there is current I in the coil, the compass needle points in the direction of the resultant magnetic field, at an angle 23° to the north. Find the current in the coil. Find the magnitude of the magnetic field due to the coil and the Earth at the center of the coil.
Transcribed Image Text:A relatively inexpensive ammeter, called a tangent galvanometer, can be made using the earth's field. A plane circular coil of N=100 turns and Radius R=15cm is oriented so the field that it produces in the center of the coil is either East or West. A compass is placed at the center of the coil. When there is no current in the coil, the compass-needle points to the north due the earth's 5.5x10^-5 T field. When there is current I in the coil, the compass needle points in the direction of the resultant magnetic field, at an angle 23° to the north. Find the current in the coil. Find the magnitude of the magnetic field due to the coil and the Earth at the center of the coil.
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