Lesson: The Magnetic Force between Parallel Constant Currents

Physics

In this lesson, we will learn how to calculate the magnetic force between two parallel current-carrying wires.

Sample Question Videos

02:01

Worksheet

Q1:

Two long, straight wires are parallel and 10 cm apart. One carries a current of 2.0 A, the other a current of 5.0 A. What is the magnitude of the force per unit length between the wires?

Q2:

The two long parallel wires shown in the figure carry currents in the same direction. If and , where , what is the magnetic field at point ?

Q3:

The figure shows two long, straight, horizontal wires that are parallel and a distance apart, where . Both wires carry a current , but in opposite directions.

What is the magnitude of the magnetic field at ?

What is the magnitude of the magnetic field at

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