22.5 Exercise 9

If you need additional support for these problems, see More Applications of Magnetism.

A cosmic ray electron moves at $7 . \text{50} \times \text{10}^{6} \text{m}/\text{s}$ perpendicular to the Earth’s magnetic field at an altitude where field strength is $1 . \text{00} \times \text{10}^{- 5} T$. What is the radius of the circular path the electron follows?