A single circular loop of wire of radius carries a current of
PHYSICS · Multi-part · AP · Physics 2: Algebra-based · Magnetism and Electromagnetism · Magnetism and Electromagnetism
Problem
A single circular loop of wire of radius 4.0cm carries a current of 3.5A. The loop lies in a vertical plane, and its center is at the origin of a coordinate system whose y-axis is horizontal and points out of the page.
Answer the following questions, giving final numeric results with appropriate units.
(a) Calculate the magnitude of the magnetic field at the center of the loop produced by the stated current.
(b) The magnitude of Earth’s field at the location of the experiment is 5.0×10−5T and is directed into the page. Determine the magnitude of the current that would have to flow in the given loop to produce a field equal in magnitude but opposite in direction to Earth’s field at the center.