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Magazine Chapter 30: Q. 4 (page 868)
Does the loop of wire in FIGURE have a clockwise current, a counterclockwise current, or no current under the following circumstances? Explain.
a. The magnetic field points out of the page and is increasing.
b. The magnetic field points out of the page and is constant.
c. The magnetic field points out of the page and is decreasing
Short Answer
(a) When the field of force is rising and points out of the page, the wire loop is clockwise.
(b) When the Flux points out of the page and is constant, the wire loop has no current.
(c) When the Flux points out of the page and is decreasing, the wire loop is counterclockwise.
Step by step solution
Introduction
A field is produced along the length of a wire loop by a current flowing through it. Curling the finger of the right hand within the direction of the current through the loop, the thumb then points within the direction of the field of force, reveals the direction of the sphere inside the loop.
Explanation
(a) The induced field is into the page, and the induced current is clockwise according to the right-hand rule.
(b) The current must be induced by a changing magnetic flux. As a result, there's no current
(c) Because the induced magnetic flux is off the page, the wire loop should be turned counterclockwise.
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