High School Physics : Understanding Magnetic Fields

Example Questions

Example Question #1 : Understanding Magnetic Fields

A current of  runs through a straight wire. If the resulting magnetic field is , what is the radius of the field?

Explanation:

Ampere's law states:

.

In other words, the magnetic field (), is equal to a constant () times the current () divided by the circumference of the magnetic field it is creating.

We are given the current, the constant, and the magnetic field strength. Using these values, we can solve for the magnetic field radius.

Notice that the  cancels out.