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The magnetic field due to current in wires in your home

Physics: Principles with Applications | 6th Edition | ISBN: 9780130606204 | Authors: Douglas C. Giancoli ISBN: 9780130606204 3

Solution for problem 7Q Chapter 20

Physics: Principles with Applications | 6th Edition

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Physics: Principles with Applications | 6th Edition | ISBN: 9780130606204 | Authors: Douglas C. Giancoli

Physics: Principles with Applications | 6th Edition

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Problem 7Q

Problem 7Q

The magnetic field due to current in wires in your home can affect a compass. Discuss the effect in terms of currents, including if they are ac or dc.

Step-by-Step Solution:

Step 1 of 1

The current in the wire makes a magnetic field, which is circular around the wire. If a compass is placed in this field, the needle will align itself in a direction tangent to the circular magnetic field lines.

When the current is a direct current (dc), the magnitude and direction of the current doesn’t change and therefore magnetic field (B) doesn’t change. When placed at one point, the compass needle will point in one direction at all times.

If the current is an alternating current (ac), the direction of current / reverses after every half-cycle and B also reverses. The compass needle that points in the reverse direction of B (magnetic field) reverses its direction at a point.

Step 2 of 1

Chapter 20, Problem 7Q is Solved
Textbook: Physics: Principles with Applications
Edition: 6
Author: Douglas C. Giancoli
ISBN: 9780130606204

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The magnetic field due to current in wires in your home