Lesson: The Magnetic Field due to a Current in a Straight WirePhysics
In this lesson, we will learn how to calculate the magnetic field produced by a current in a straight wire.
Sample Question Videos
The diagram shows a long straight wire that carries a current . As a result, a magnetic field that is far stronger than Earth’s magnetic field can be measured at point , which is a short distance away from the wire. If a small compass is placed at point , with its face pointing in the opposite direction to the current, which direction will the needle point?
A long, straight wire is carrying a constant current that induces a magnetic field . Magnetic field lines of are shown in the diagram. Based on the diagram, state the direction of the conventional current in the wire.
Which of the following correctly describes the relationship between , , and , where is the magnetic field strength measured at a perpendicular distance away from a long straight wire carrying a constant current of ?