Suppose an electron and a proton with the same velocity are traveling in the same direct...

Suppose an electron and a proton with the same velocity are traveling in the same direction when they enter the bubble chamber in Figure 20.17. Each moves in a helical trajectory inside the chamber. How does the radius of the electron’s helix compare with the radius of the proton’s helix?

(a) The helix followed by the electron has a smaller radius.

(b) The helix followed by the electron has a larger radius.

(c) The electron and proton helices have the same radius.

(reference figure 20.17)